Hadronic decays and cross- sections at Ψ” from CLEO-c · 2005. 7. 27. · Southern Methodist...
Transcript of Hadronic decays and cross- sections at Ψ” from CLEO-c · 2005. 7. 27. · Southern Methodist...
HadronicHadronic decays decays and crossand cross--sections at sections at ΨΨ”” from CLEOfrom CLEO--cc
Yongsheng GaoSouthern Methodist University
(CLEO Collaboration)
HEP2005, Lisbon, Jul. 21 HEP2005, Lisbon, Jul. 21 ── 27, 200527, 2005
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 2
Preliminary CLEO results
ΨΨ”” → non DD final states (VP, multi-body) ((281 pb281 pb--11, 55.8 pb, 55.8 pb--11, CLEO CONF 05, CLEO CONF 05--1, CLNS 05/1921)1, CLNS 05/1921)
Inclusive production of Inclusive production of ηη, , ηη’’, , ΦΦ in D decaysin D decays((281 pb281 pb--11, CLEO CONF 05, CLEO CONF 05--4)4)
Absolute D Absolute D hadronichadronic BR & BR & ΨΨ”” → DD cross-section((55.8 pb55.8 pb--11 , CLNS 05/1904, submitted to PRL), CLNS 05/1904, submitted to PRL)
p and K timep and K time--like form factors at like form factors at √√s = 3.671 s = 3.671 GeVGeV((20.7 pb20.7 pb--11, CLEO CONF 05, CLEO CONF 05--9)9)
BF measurement of BF measurement of DD++ → K0s/K0
L π+
((281 pb281 pb--11)) Shown for the first time
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 3
CESR-c
Ebeam = 1.5 – 5.6 GeV
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 4
CLEO-c Detector & Data• New inner drift chamber replaced old silicon vertex
• 1T B field (old 1.5 T)
• Track (93% of 4π): σ = 0.6% @ 1 GeV
• PID: Rich (80% of 4π), dE/dx, EM calorimeter, muon (> 1GeV)
• Eγ: σ = 2.2% @ 1 GeV,
5% @ 100MeV.
CLEO-c ≅ CLEO III281 pb-1 at ψ(3770)
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 5
ψ(3770) Analysis Techniques
Fully reconstruct 1st D “the tag”, then analyze decay of 2nd D to extract exclusive or inclusive properties.
ψ(3770) ~ DDbar thresholdNo extra fragmentation = simpler
geometry / combinationClean neutrino reconstructionHigh tagging efficiency at 25% of
all D’s produced.
⇓
K+ π-
e−e+
D- Tag
( )
( )beam
22beamBC
E E D E
M E p D
∆ = −
= −
The MARK III MethodThe MARK III Method
π-
⇓D+K0
S
π+
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 6
Absolute Absolute HadronicHadronic D Decay D Decay BRsBRs
Many current measurements determined with respect to reference modes: D0→K-π+, D+→K-π+π+
Input to many measurements (e.g. Vcb from B→D*lν)
CLEO-c at ψ(3770) provides:– Absolute/relative precise measurements – Most precise measurement of D hadronic BRs
Much easier to do at threshold and in pairs than at 10GeV!Byproduct: DD production cross sections
hep-ex/0504003, submitted to PRL (55.8 pb-1)
Updated results with 281 pb-1 in progress.
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 7
e+ e-
D X
ijjiDDij BBNN ε=iiDDi BNN ε=
Single tagged Double tagged
e+ e-
D Xj
D Xi D Xi
ij
j
j
iji
ji
ij
ij
jiDD
NN
B
NNN
N
εε
εεε
=
=
π −
K +
π −
π +
π +
K −
D K π π+ − + +→,
DD K
K π
π
π
π+
− +
− +
−
+
−→
→
15,120±180377±20
Absolute Absolute HadronicHadronic D Decay D Decay BRsBRs
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 8
Fitting techniqueSimultaneous fit for all BR & cross sections is performed
– Charged and neutral modes fit simultaneously
– All correlations taken into account
Efficiencies– Denominator of efficiency may be determined using missing
mass in data and MC• Data & MC: 0.7% for charged, 2.0% for π0, 3.0% for K0
S– Include effects of final state radiation (FSR)
+−++−++
+++−++−+
−++−+−+−
→
→
ππππππ
ππππππ
ππππππ
KKKKKKKD
KKKD
SS
S
, ,
, , , , ,
000
00
00
Absolute Absolute HadronicHadronic BRsBRs & N& NDDDD
W. M. Sun, physics/0503050, CLNS 05/1912, submitted to NIM.
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 9
Single Tag (log scale)!
2,484±51(combined)
1,650±42(combined)
3 D0 Modes 6 D+ Modes D0
D+
Double Tag
Double Tag
Single/Double Tag YieldsSingle/Double Tag YieldsPrelim
inary, submitted to PR
L
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 10
Normalized to PDG
Six modes more
precise than PDG.
σ(DD)=6.39±0.10+0.17–0.08 nb
( )( ) 01.002.078.0
00±±=
→
→−+
−+−+
DDeeDDee
σσ
Absolute Absolute BRsBRs & Production & Production xsectionsxsections
55.8 pb-1
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 11
77,387±281
D0→K+π-
D-→K+π-π-
D0→K+ π- π0
D0→K+ π- π- π+
49,418±246 101,960±476
76,178±306
Single Tag from 281 pbSingle Tag from 281 pb--11
Preliminary
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 12
Inclusive Inclusive ηη, , ηη’’, , ΦΦ in D decaysin D decaysSingle tag yield from 281 pb-1 at ψ(3770)
Preliminary
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 13
Inclusive Inclusive ηη, , ηη’’, , ΦΦ in D decaysin D decaysPη>0.3GeV
Pη>0.3GeV
0.3<Pη<1.0GeV
0.3<Pη<1.0GeV
BKG BKG
η’ in D0 η’ in D+
η’ in D+η’ in D0BKG BKG
Preliminary
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 14
DD++ →→ KK00ssππ++ and Kand K00
LLππ++
DD++cc cc
cc
dd dd
dd
dd
dd dd
dd
uudd
ss
ddssuu
uuππ++
ππ++
ππ++
ss
KK00
KK00
KK00
DD++
DD++
B(DB(D++→→KK00LLππ++)>)>B(DB(D++→→ KK00
ssππ++))
Phys. Phys. LettLett. B349, 363 (1995). B349, 363 (1995)I. I. BigiBigi & H. Yamamoto& H. Yamamoto
Reconstruct DReconstruct D-- and and ππ++
Missing mass squaredMissing mass squared
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 15
DD++ →→ KK00s,Ls,Lππ++ and and ηηππ++
Br(D+ → K0S,L π+) = (3.06 ± 0.06 ± 0.16)%
Br(D+ → η π+) = (0.39 ± 0.03 ± 0.03)%
= 0.01 ± 0.04 ± 0.07
Preliminary
D+→ηπ+
D+→K0S,Lπ+
D+→π0π+
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 16
σ(ψ’’→DD)=(6.39 ±0.10±0.21) nb (CLEO, 55.8 pb-1)
ψψ(3770) non(3770) non--DD decaysDD decays
σ(ψ’’→hadrons)~(7.9±0.6) nb ( J. Rosnerhep-ph/0411196)
Is there a deficit?
Search for exclusive decay modes at CLEO:ψ’’→ two-body (VP) (281 pb-1/21 pb-1, this talk)
ψ’’→ XJ/ψ, γχCJ (David Miller’s talk)
ψ’’→ multi-body (55.8 pb-1/21 pb-1, this talk)
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 17
ψψ(3770) (3770) →→ VP, multiVP, multi--bodybody
VP = ρ/ω/Φ + π/η/η’, K*K, also π+π-π0, b1π
multi-body = combinations of π, K, p, η, ω,Φ
Suppress J/ψ→ µ+µ- or hadronic decays
Compare ψ(3770) with scaled continuum
Energy conservation: 0.98 < Evis/Ecm < 1.02
Momentum conservation: |PV – PP|/Ecm<0.04
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 18
ψψ(3770) (3770) →→ VP decaysVP decaysPrelim
inary: 281 pb-1
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 19
for each channel, on-ψ(3770) yields consistentwith continuum prediction except:Br(ψ(3770) → φη) = (3.1±0.6±0.3±0.1)×10-4
ψ(3770) → π+π-π0, ρ0π0 and K*+K- are suppressed.form factors of ωπ0, ρη and ρη’ are obtained
281 pb-1 data at 3.77 GeV21 pb-1 data at 3.67 GeV
Form factor measurements
ψψ(3770) (3770) →→ VP decaysVP decaysPreliminary
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 20
Submitted to PR
L: 55.8 pb-1
ψψ(3770) (3770) →→ multimulti--bodybody
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 21
Timelike
HadronicHadronic EM Form Factors EM Form Factors Brodsky & Lepage
(PRD 22, 2157 (1980))
Mesons:
Baryons:
|||)(||)(| 2
22
QQQF sα∝
|||)(||)(| 4
222
QQQF sα∝
Spacelike
pp pp →→ ee++ee--ee++ee-- →→ KK++KK--
ee++ee-- →→ pppp
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 22
Proton Charged Kaon
)0|)(|(10))()(52.1(|)5.13(| 207.003.0
26.020.0 =×= −+
−+− sGsyststatG P
EPM
210))(14.0)(38.028.6(|)5.13(| −×±±= syststatFKFirst precision measurement
HadronicHadronic EM Form Factors EM Form Factors
20.7 pb-1 at 3.671 GeV
)|)(||)(|(10))()(39.1(|)5.13(| 206.003.0
24.018.0 sGsGsyststatG P
MPE
PM =×= −+
−+−
ee++ee-- →→ pppp ee++ee-- →→ KK++KK--
Preliminary
Southern Methodist Univ.Southern Methodist Univ. Yongsheng Gao Yongsheng Gao 23
Preliminary CLEO results
ΨΨ”” → non DD final states (VP, multi-body) ((281 pb281 pb--11, 55.8 pb, 55.8 pb--11, CLEO CONF 05, CLEO CONF 05--1, CLNS 05/1921)1, CLNS 05/1921)
Inclusive production of Inclusive production of ηη, , ηη’’, , ΦΦ in D decaysin D decays((281 pb281 pb--11, CLEO CONF 05, CLEO CONF 05--4)4)
Absolute D Absolute D hadronichadronic BR & BR & ΨΨ”” → DD cross-section((55.8 pb55.8 pb--11 , CLNS 05/1904, submitted to PRL), CLNS 05/1904, submitted to PRL)
P and K timeP and K time--like form factors at like form factors at √√s = 3.671 s = 3.671 GeVGeV((20.7 pb20.7 pb--11, CLEO CONF 05, CLEO CONF 05--9)9)
BF measurement of BF measurement of DD++ → K0s/K0
L π+
((281 pb281 pb--11))