Post on 19-Sep-2020
```
March 5-7th 2012 Michael Hartmann on behalf of the ANKE collaboration
Momentum dependence of the Φ-meson nuclear
transparency ―
plus new results on pprarrppΦ
Mit
glie
d d
er
Helm
holt
z-G
em
ein
schaft
Resonance Workshop at UT Austin
UT Austin March 5-7th 2012
2
Scope of the talk
pArarrФ (K+K-) X Tp=283 GeV
COSY facilities and some advertisement
pprarrppФ (K+K-) Tp=283 GeV (76 MeV excess energy)
MH etal nucl-ex12013517 (acc in PRC)
QJ Ye etal nucl-ex12025451
UT Austin March 5-7th 2012
3
Circumference ~ 184m
Polarized protons and deuterons
max momentum ~ 37 GeVc
Electron and stochastic cooling
Hadron physics with hadronic probes
COSY ndash experimental facilities
UT Austin March 5-7th 2012
4
Advertisement KKΦ production at COSY
(wwwfz-juelichdeikp orMH PoS 057 (2011))
DISTO
COSYKK amp Φ production in pp pd amp dd (world data)
UT Austin March 5-7th 2012
5
Φ(rarrK+K-) production in pp
UT Austin March 5-7th 2012
6
ppppФ total cross sections
ANKE DISTO
only tot
76 MeV (new)
ldquoSsrdquo + pp-FSI
higher PWno pp-FSI
UT Austin March 5-7th 2012
7
ppppФ (differential cross sections) at ε= 185 MeV
close to threshold the angular decay
distribution must display a sin2θΦK+
_____________________________
Φ in relative S-wave
transition from 3P1 (pp)-entrance
channel to 1S0 (pp) final-state
clear effect of pp-FSI
MH etal PRL 96 (2006) 242301
UT Austin March 5-7th 2012
8
Non-Ф res ppK+K- production at ε= 76 MeV (new)
ldquooutside Φrdquo
no acceptance correction
M (K minus pp)
M (K + pp)F=F pp(q pp) times
F Kp(qKp1)times
F Kp (qKp2)times
F K K
UT Austin March 5-7th 2012
9
ratio of exp K+K- inv mass to MC (without KK interaction)
KK production amplitudes (I=01)
pp rarr ppK+K- (total cross section)
+ K-p-FSI+ pp -FSI phase space
ldquoallrdquo
11 ANKE (COSY) DISTO
185 MeV 76 MeV
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
2
Scope of the talk
pArarrФ (K+K-) X Tp=283 GeV
COSY facilities and some advertisement
pprarrppФ (K+K-) Tp=283 GeV (76 MeV excess energy)
MH etal nucl-ex12013517 (acc in PRC)
QJ Ye etal nucl-ex12025451
UT Austin March 5-7th 2012
3
Circumference ~ 184m
Polarized protons and deuterons
max momentum ~ 37 GeVc
Electron and stochastic cooling
Hadron physics with hadronic probes
COSY ndash experimental facilities
UT Austin March 5-7th 2012
4
Advertisement KKΦ production at COSY
(wwwfz-juelichdeikp orMH PoS 057 (2011))
DISTO
COSYKK amp Φ production in pp pd amp dd (world data)
UT Austin March 5-7th 2012
5
Φ(rarrK+K-) production in pp
UT Austin March 5-7th 2012
6
ppppФ total cross sections
ANKE DISTO
only tot
76 MeV (new)
ldquoSsrdquo + pp-FSI
higher PWno pp-FSI
UT Austin March 5-7th 2012
7
ppppФ (differential cross sections) at ε= 185 MeV
close to threshold the angular decay
distribution must display a sin2θΦK+
_____________________________
Φ in relative S-wave
transition from 3P1 (pp)-entrance
channel to 1S0 (pp) final-state
clear effect of pp-FSI
MH etal PRL 96 (2006) 242301
UT Austin March 5-7th 2012
8
Non-Ф res ppK+K- production at ε= 76 MeV (new)
ldquooutside Φrdquo
no acceptance correction
M (K minus pp)
M (K + pp)F=F pp(q pp) times
F Kp(qKp1)times
F Kp (qKp2)times
F K K
UT Austin March 5-7th 2012
9
ratio of exp K+K- inv mass to MC (without KK interaction)
KK production amplitudes (I=01)
pp rarr ppK+K- (total cross section)
+ K-p-FSI+ pp -FSI phase space
ldquoallrdquo
11 ANKE (COSY) DISTO
185 MeV 76 MeV
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
3
Circumference ~ 184m
Polarized protons and deuterons
max momentum ~ 37 GeVc
Electron and stochastic cooling
Hadron physics with hadronic probes
COSY ndash experimental facilities
UT Austin March 5-7th 2012
4
Advertisement KKΦ production at COSY
(wwwfz-juelichdeikp orMH PoS 057 (2011))
DISTO
COSYKK amp Φ production in pp pd amp dd (world data)
UT Austin March 5-7th 2012
5
Φ(rarrK+K-) production in pp
UT Austin March 5-7th 2012
6
ppppФ total cross sections
ANKE DISTO
only tot
76 MeV (new)
ldquoSsrdquo + pp-FSI
higher PWno pp-FSI
UT Austin March 5-7th 2012
7
ppppФ (differential cross sections) at ε= 185 MeV
close to threshold the angular decay
distribution must display a sin2θΦK+
_____________________________
Φ in relative S-wave
transition from 3P1 (pp)-entrance
channel to 1S0 (pp) final-state
clear effect of pp-FSI
MH etal PRL 96 (2006) 242301
UT Austin March 5-7th 2012
8
Non-Ф res ppK+K- production at ε= 76 MeV (new)
ldquooutside Φrdquo
no acceptance correction
M (K minus pp)
M (K + pp)F=F pp(q pp) times
F Kp(qKp1)times
F Kp (qKp2)times
F K K
UT Austin March 5-7th 2012
9
ratio of exp K+K- inv mass to MC (without KK interaction)
KK production amplitudes (I=01)
pp rarr ppK+K- (total cross section)
+ K-p-FSI+ pp -FSI phase space
ldquoallrdquo
11 ANKE (COSY) DISTO
185 MeV 76 MeV
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
4
Advertisement KKΦ production at COSY
(wwwfz-juelichdeikp orMH PoS 057 (2011))
DISTO
COSYKK amp Φ production in pp pd amp dd (world data)
UT Austin March 5-7th 2012
5
Φ(rarrK+K-) production in pp
UT Austin March 5-7th 2012
6
ppppФ total cross sections
ANKE DISTO
only tot
76 MeV (new)
ldquoSsrdquo + pp-FSI
higher PWno pp-FSI
UT Austin March 5-7th 2012
7
ppppФ (differential cross sections) at ε= 185 MeV
close to threshold the angular decay
distribution must display a sin2θΦK+
_____________________________
Φ in relative S-wave
transition from 3P1 (pp)-entrance
channel to 1S0 (pp) final-state
clear effect of pp-FSI
MH etal PRL 96 (2006) 242301
UT Austin March 5-7th 2012
8
Non-Ф res ppK+K- production at ε= 76 MeV (new)
ldquooutside Φrdquo
no acceptance correction
M (K minus pp)
M (K + pp)F=F pp(q pp) times
F Kp(qKp1)times
F Kp (qKp2)times
F K K
UT Austin March 5-7th 2012
9
ratio of exp K+K- inv mass to MC (without KK interaction)
KK production amplitudes (I=01)
pp rarr ppK+K- (total cross section)
+ K-p-FSI+ pp -FSI phase space
ldquoallrdquo
11 ANKE (COSY) DISTO
185 MeV 76 MeV
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
5
Φ(rarrK+K-) production in pp
UT Austin March 5-7th 2012
6
ppppФ total cross sections
ANKE DISTO
only tot
76 MeV (new)
ldquoSsrdquo + pp-FSI
higher PWno pp-FSI
UT Austin March 5-7th 2012
7
ppppФ (differential cross sections) at ε= 185 MeV
close to threshold the angular decay
distribution must display a sin2θΦK+
_____________________________
Φ in relative S-wave
transition from 3P1 (pp)-entrance
channel to 1S0 (pp) final-state
clear effect of pp-FSI
MH etal PRL 96 (2006) 242301
UT Austin March 5-7th 2012
8
Non-Ф res ppK+K- production at ε= 76 MeV (new)
ldquooutside Φrdquo
no acceptance correction
M (K minus pp)
M (K + pp)F=F pp(q pp) times
F Kp(qKp1)times
F Kp (qKp2)times
F K K
UT Austin March 5-7th 2012
9
ratio of exp K+K- inv mass to MC (without KK interaction)
KK production amplitudes (I=01)
pp rarr ppK+K- (total cross section)
+ K-p-FSI+ pp -FSI phase space
ldquoallrdquo
11 ANKE (COSY) DISTO
185 MeV 76 MeV
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
6
ppppФ total cross sections
ANKE DISTO
only tot
76 MeV (new)
ldquoSsrdquo + pp-FSI
higher PWno pp-FSI
UT Austin March 5-7th 2012
7
ppppФ (differential cross sections) at ε= 185 MeV
close to threshold the angular decay
distribution must display a sin2θΦK+
_____________________________
Φ in relative S-wave
transition from 3P1 (pp)-entrance
channel to 1S0 (pp) final-state
clear effect of pp-FSI
MH etal PRL 96 (2006) 242301
UT Austin March 5-7th 2012
8
Non-Ф res ppK+K- production at ε= 76 MeV (new)
ldquooutside Φrdquo
no acceptance correction
M (K minus pp)
M (K + pp)F=F pp(q pp) times
F Kp(qKp1)times
F Kp (qKp2)times
F K K
UT Austin March 5-7th 2012
9
ratio of exp K+K- inv mass to MC (without KK interaction)
KK production amplitudes (I=01)
pp rarr ppK+K- (total cross section)
+ K-p-FSI+ pp -FSI phase space
ldquoallrdquo
11 ANKE (COSY) DISTO
185 MeV 76 MeV
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
7
ppppФ (differential cross sections) at ε= 185 MeV
close to threshold the angular decay
distribution must display a sin2θΦK+
_____________________________
Φ in relative S-wave
transition from 3P1 (pp)-entrance
channel to 1S0 (pp) final-state
clear effect of pp-FSI
MH etal PRL 96 (2006) 242301
UT Austin March 5-7th 2012
8
Non-Ф res ppK+K- production at ε= 76 MeV (new)
ldquooutside Φrdquo
no acceptance correction
M (K minus pp)
M (K + pp)F=F pp(q pp) times
F Kp(qKp1)times
F Kp (qKp2)times
F K K
UT Austin March 5-7th 2012
9
ratio of exp K+K- inv mass to MC (without KK interaction)
KK production amplitudes (I=01)
pp rarr ppK+K- (total cross section)
+ K-p-FSI+ pp -FSI phase space
ldquoallrdquo
11 ANKE (COSY) DISTO
185 MeV 76 MeV
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
8
Non-Ф res ppK+K- production at ε= 76 MeV (new)
ldquooutside Φrdquo
no acceptance correction
M (K minus pp)
M (K + pp)F=F pp(q pp) times
F Kp(qKp1)times
F Kp (qKp2)times
F K K
UT Austin March 5-7th 2012
9
ratio of exp K+K- inv mass to MC (without KK interaction)
KK production amplitudes (I=01)
pp rarr ppK+K- (total cross section)
+ K-p-FSI+ pp -FSI phase space
ldquoallrdquo
11 ANKE (COSY) DISTO
185 MeV 76 MeV
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
9
ratio of exp K+K- inv mass to MC (without KK interaction)
KK production amplitudes (I=01)
pp rarr ppK+K- (total cross section)
+ K-p-FSI+ pp -FSI phase space
ldquoallrdquo
11 ANKE (COSY) DISTO
185 MeV 76 MeV
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
10
ppppФ production at ε= 76 MeV (new)
ldquoinside Φrdquo
no acceptance correction
spin-averaged squared transition matrix element
multiplied by pp-FSI (Jost function)
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
11
hellip and final differential distributions at 76 MeV
angular distributions (symmetric about cos θ = 0)
polar decay angle
ANKE DISTO (83 MeV)
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
12
hellip and final differential distributions at 76 MeV
185 MeV (for comparison)
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
13
hellip and ppФ total cross section dilemma
full
Ps
Pp
SpSs
76 MeV
Simplest way out A Φp threshold enhancement leads to a significant energy dependence of some of the AL l coefficients
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
14
Φ(rarrK+K-) production in pA
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
15
Meson spectral function
Φ is a long-lived meson
λdec
= ħcΓ0= 44 fm gtgt R(Au)
Ф in free space
(PDG 2008)
M0 ndash pole mass Γ
0 ndash meson width
M0 = 10195 GeV
Γ0 = 426 MeV
S (M )=1π
Γ02
(MminusM 0)2+(Γ02)
2
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
16
Φ in nuclear matter
A general picture of numerous studies in different approaches eg effective Lagrangians and QCD sum rules
- mass modification is small
- main medium effect on the Ф is a significant increase of its width by up to an order of magnitude
Meson spectral function
SlowastM =
1
0minus2ImU opt 2
MminusM 0ReU opt20minus2ImUopt 2
2
Γlowast
lowast
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
17
Methods of Φ-width measurement
Study of the meson spectral function - measure low momentum Φs via leptonic decays Not really done yet
- Φrarre+e- (BR = 310-4)
- ΦrarrK+K- (BR = 049 K- FSI hadronic potential)
KEK-PS pA 12 GeV Γ asymp 15 MeV m asymp -34)
RMuto et al PRL 98 (2007) 042501
Φrarre+e-
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
18
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
19
Methods of Φ-width measurement
Attenuation measurements of the Φ flux SPring-8 photo-production up-coming CLAS results
Φ survival probability in the nucleus matter rest frame In-medium width deduced from the target mass dependence
D=exp (minusintz
infin
dlΓlowast(ρ(r ))M 0
pΦ) ρ(r )minuslocal nuclear density
SPring-8 LEPS experiment COSY experiment at ANKE
Reaction γA rarr Φ Χ via K+K- decayγ-Energy 15 ― 24 GeV Targets Li C Al Cu
Result large σФN = 35+17 mb using Glauber-type multi-scatt theory (free σФN asymp 8-10 mb)
T Ishikawa et al PLB 608 (2005) 215
Reaction pA rarr Φ Χ via K+K- decayp-Energy 283 GeV ( ε free NNasymp 76MeV )Targets C Cu Ag Au
Momentum and (06 ― 16) GeVcangular range 0ole Θ
Φle 8o
-11
dominate K+K- BR =049
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
20
ANKE ndash forward angle magnetic spectrometer at internal target position of COSY
Fd
Pd
Nd
Pd ndash positive detector system Fd ndash forward detector system Nd ndash negative detector system(STT ndash silicon tracking telescope)
STT
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
21
Ф K+K- selection
all
delayed
7000ndash10000 Φs for each target (C Cu Ag Au)
all K+
K+K-
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
22
T A=
A
A
N
Normalization of Φ production cross section
A
C=N
A
N
C
N
C
N
A
A
C
R=T A
T C
=12A
A
C nuclear transparency ratio
To normalize the Φ production cross section we use the known pion data
We present the A-dependence of the Φ production in the following form
A
C= A12 π+ p = 05 GeVc Θ ~ 00
απ = 038 plusmn 002 ( 283GeV)
The Φ-meson yield (production cross section) follows a target mass
dependence of A056 plusmn 003
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
23
Transparency ratios experiment
ANKE
Any interpretation of the transparency ratio has to rely on a detailed theoretical treatment
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
24
Transparency ratios experiment and models
ANKE
VMagas et al PRC 71 (2005) 065202LRoca (private communication)
ValenciaEOset et alMC amp Chiral Unitary Approach
EParyev JPhys G 36 (2009) 015103
MoscowEParyevNuclear Spectral Function Approach
HSchade BKaumlmpfer (private communication) cf PRC 81 (2010) 034902
RossendorfBKaumlmpfer et alBUU
Relevant features for models
bull forward acceptance
bull two-step production processes
bull σpnrarrpnΦσ
pprarrppΦasymp 4
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
25
In-medium width ΓΦ and σ
ΦN cross section
ΓΦlab
(ρ0)=pΦ
EσΦ N
ρ0LDA
APolyanskiy et al PLB 695 (2011) 74
ΓΦ
lab asymp 33-50 MeV ( ltpΦgt = 11 GeVc ρ
0= 016 fm-3 )
Model dependent analysis of the ANKE
MoscowPParyevRossendorfBKaempfer etalValenciaEOset et al
MH
et
al
nu
cl-e
x1
201
3517
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
26
Double differential cross section of Φ production
+ common systematics ~ 20
Excess in low momentum part
ANKEBUUNSP appr
MH
et
al
nu
cl-e
x12
013
517
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement
UT Austin March 5-7th 2012
27
Sum up
model dependent ANKE data analysis suggest
large in-medium Φ-meson width absorption (high momentum part) increasing with momentum
supported by Spring-8 amp JLAB results differential cross sections are not completely reproduced by model calculations (excess at lower momenta) results differ from the Valencia predictions (Φ in-medium self-energy)
pA
pp
MH
et
al
nu
cl-e
x12
013
517
QJ
Y
e et
al
n
ucl
-ex
1202
545
1
Thank you
truncated PW description of ppΦ shows that the contribution from purely S-wave final states represents only a small fraction of the total cross section at ε=76 MeV
explains why there is no S-wave pp-FSI in ANKE amp DISTO data
however in order to explain the energy dependence of the ppΦ total cross section seems to require a low mass Φp enhancement