The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka...

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1 The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF Cyclotron ANKE WASA 10 m ANKE, WASA, TOF Detector Setup Physics Examples Summary and Outlook

Transcript of The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka...

Page 1: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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The COSY Experiments

ANKE, WASA, and TOF

Dieter Grzonka , IKP-1

TOF

Cyclotron ANKE

WASA

10 m

ANKE, WASA, TOF

• Detector Setup

• Physics

• Examples

Summary and Outlook

Page 2: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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ANKE TOF

COSY: experimental installations for hadron physics

with well focussed physics program

internal

magnetic spectrometer

spin physics

internal

~ 4π detector

symmetries

external

geometry spectrometer

strangeness

WASA

Page 3: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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ANKE - Apparatus for Studies of Nucleon and Kaon Ejectiles

internal magnetic spectrometer,

C-type dipole, gap height 20 cm

tracking detectors: scintillators,

wire chambers,

Si-telescope close to target

clustertarget,

polarized atomic beam and storage cell

Page 4: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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ANKE Physics Program

measurements: meson production (π, η, η‘, ω, ϕ, K ) in pp, pd, dd reactions,

medium effects subthreshold K-prod., in medium ϕ width,

pA reactions, pn-system, d-breakup, n K+ Σ+, ...

example: η-mass determination

precise beam momentum determination

using spin resonance (Δp/p < 6 . 10-5 ) mη = 547.873 ± 0.005 ±0.027 MeV/c2

pd → 3He η

Phys.Rev.D85 (2012) 112011

Page 5: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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ANKE Physics Program

focus: spin dependence of NN interaction and pion production

→ detailed understanding of nuclear forces and reactions

at intermediate energies

d p → {pp}s n : sensitive to spin-spin term in np → pn amplitude

d p → {pp}s n →

impulse

approximation

with SAID

amplitudes

d p → {pp}s n

d p → {pp}s n → →

→ polarization data

needed

[A. Kacharava, C. Wilkin, arXiv:1212.2771]

Page 6: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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ANKE Physics Program

accepted and proposed experiments

p d → p d η (→ dη scattering length, η-A bound states )

continuation of the spin program

double polarization, spin correlations

measurements with logitudinal spin

→ Sibirian snake

p p → pp / →

p d → p d →

Page 7: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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WASA - Wide Angle Shower Apparatus

tracking detectors: scintillators, wire chambers,

EM calorimeter (CsI),

Pellet target, thin wall SC magnet (1T)

close to 4π detection system for

charged particles and photons

Page 8: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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WASA Physics Program

tests of fundamental symmetries

isospin symmetry

C, CP, CPT symmetry

transition form factors

meson production dynamics

exotic states

main area: meson decay studies (π0, η, ω)

via : pp→pp M and pd→3He M

experimental aspects:

pp : high production rate

high background

pd: low background

low production rate

Page 9: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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WASA Physics Program

tests of fundamental symmetries

isospin symmetry

C, CP, CPT symmetry

transition form factors

meson production dynamics

exotic states

main area: meson decay studies (π0, η, ω)

via : pp→pp M and pd→3He M

experimental aspects:

pp : high production rate

high background

pd: low background

low production rate

e.g. η production

inclusive

pd → 3He X „inclusive“

pp → pp X

η identification: missing mass=√(Ein−Eout )2−(Pin−Pout )

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Page 10: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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WASA Physics Program

tests of fundamental symmetries

isospin symmetry

C, CP, CPT symmetry

transition form factors

meson production dynamics

exotic states

main area: meson decay studies (π0, η, ω)

via : pp→pp M and pd→3He M

experimental aspects:

pp : high production rate

high background

pd: low background

low production rate

e.g. η production

inclusive

pd → 3He X „inclusive“

pp → pp X

pp → pp X

X → π+π-π0 channel selection

η identification: missing mass=√(Ein−Eout )2−(Pin−Pout )

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Page 11: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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WASA Physics Program

tests of fundamental symmetries

isospin symmetry

C, CP, CPT symmetry

transition form factors

meson production dynamics

exotic states

main area: meson decay studies (π0, η, ω)

via : pp→pp M and pd→3He M

experimental aspects:

pp : high production rate

high background

pd: low background

low production rate

e.g. η production

available data:

pd → 3He η 3 . 106 η (reconstructed)

pp → pp η 5 . 108 η (produced)

Page 12: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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meson decay studies at WASA

η → π0 π0 π0

/ π+ π- π0

→ π+ π- γ

→ π+ π- e+e-

→ e+ e- e+ e- / γ e+ e-

→ e+ e-

→ e+ e-

→ π0 e+ e-

→ π+ π- π0

→ π+ π-

isopspin breaking decay, sensitive to mu-md

Dalitz plot parameters, ππ scattering parameter

box anomaly π+

γ

π-

η

CP violation (virtual photon asymmetry)

transition form factor

physics beyond SM (BR ~ 10-9 )

physics beyond SM , discrepancy between KTEV data and theory

transition form factor, deviation from VMD prediction

π0

ω

triangle / box anomaly, fsi

ρ-ω interference

Page 13: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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Experiments at WASA

analysis of pp data:

increased statistics by an order of magnitude

η → π+ π- e+ e- (PDG:

br = 2.68 ±0.11 . 10-4 )

WASA preliminary (±0.27stat±0.22sys

. 10-4 )

Theory

br = 3.1 . 10-4

KLOE : Aϕ = -0.6 (±3.1) % theory : Aϕ < 1 %

WASA preliminary: Aϕ = 0.4 (±9±3) %

(D. Coderre)

Page 14: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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Experiments at WASA

analysis of pp data:

increased statistics by an order of magnitude

η → π+ π- e+ e- (PDG:

br = 2.68 ±0.11 . 10-4 )

WASA preliminary (±0.27stat±0.22sys

. 10-4 )

Theory

br = 3.1 . 10-4

KLOE : Aϕ = -0.6 (±3.1) % theory : Aϕ < 1 %

WASA preliminary: Aϕ = 0.4 (±9±3) %

(D. Coderre)

ABC effect

enhancement at low mass region of Mππ

observed in: pn → dπ0π0 / dπ+π-

pd → 3He π0π0 / 3He π+π-

dd → 4He π0π0 / 4He π+π-

pn → R → ΔΔ → d π0π0

I(JP) = 0 (3+), m = 2.38 GeV , Γ = 70 MeV

Page 15: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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TOF – Time Of Flight Spectrometer

lH2 target

Ø 6 mm

up to 9 m with

additional moduls

tracking of charged particles

vertex reconstruction, delayed decays

→ event reconstruction from geometry / tof

neutral particle detection → missing mass,

neutron detector in forward direction

Page 16: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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TOF – Time Of Flight Spectrometer

Reaction channels studied at TOF

pp → pp γ

π0

π+π-

η

ω

pp → pp π+π-

ω

dp → pp pπ-

pp → p K+ Λ

p K+ Σ0

p K0 Σ+

n K+ Σ+

pd → p p K0 Λ

pp → p K+ Λ

pd → p p K0 Λ

present studies:

hyperon production

•high statistics

(Dalitz plot analysis)

p K+ Λ events:

150k at 2.7 GeV/c

120k at 2.95 GeV/c

•polarization observables

polarized beam

(≤70% polarization)

self-analyzing weak decay

Λ→ p π-

→ PN, AN , DNN

Page 17: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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The pKΛ – Dalitz plot

N*(1650)

N*(1720)

FSI

P(p-Λ) low

cusp

mpΛ at NΣ threshold

Data 2010 (2.95 GeV/c)

Page 18: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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The pKΛ – Dalitz plot

N*(1650)

N*(1720)

P(p-Λ) low

mpΛ at NΣ threshold

Data 2010 (2.95 GeV/c)

2.7 GeV/c

2.9 GeV/c

3.1 GeV/c

3.3 GeV/c

N*(1650)

N*(1720)

mΛp2 / GeV2/c2

K2 /

GeV

2/c

2

Page 19: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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Comparison of 2.7 GeV/c and 2.95 GeV/c Data

strong FSI (→ extraction of scattering length

a= -1.28 ±0.11±0.3 )

N* strong at 2.95 GeV/c, weak at 2.7 GeV/c pΣ cusp effect not visible at 2.7 GeV/c

2.95 GeV/c data: M. Röder,

2.7 GeV/c data : F. Hauenstein

Page 20: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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Comparison of 2.7 GeV/c and 2.95 GeV/c Data

strong FSI (→ extraction of scattering length

a= -1.28 ±0.11±0.3 )

N* strong at 2.95 GeV/c, weak at 2.7 GeV/c pΣ cusp effect not visible at 2.7 GeV/c

2.95 GeV/c data: M. Röder,

2.7 GeV/c data : F. Hauenstein

Λ polarization

2.95 GeV/c

2.7 GeV/c

Page 21: The COSY Experiments ANKE, WASA, and TOF · The COSY Experiments ANKE, WASA, and TOF Dieter Grzonka , IKP-1 TOF ANKE Cyclotron WASA 10 m ANKE, WASA, TOF • Detector Setup • Physics

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ANKE TOF WASA

Summary

magnetic spectrometer

large acceptance

in forward direction

precise momentum reconstruction

polarized targets

spin physics

~ 4π detector for charged particles

and photons

pellet target → high luminosities

rare decay studies

symmetries

geometry spectrometer

precise tracking

reconstruction of delayed decays

hyperon production

strangeness

precise COSY beam combined with optimized detector installations

→ improved understanding of hadron physics

double polarization studies,

including logitudinal spin

( Sibirian snake )

π0 → e+ e- (physics beyond SM),

d d → α π0 (isospin violation)

data analysis

Outlook data analysis

pp → p K+ Λ

(→ at )

pd → p p K0 Λ