stori’02carsten schwarz physics with p at the future gsi facility physics program detector set-up...
TRANSCRIPT
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STORI’02 Carsten Schwarz
Physics with p at the Future GSI Facility
• Physics program
• Detector set-up p
e- cooler detector
High Energy Storage RingHESR
High luminosity modePmax = 1.5-15 GeV/cLmax < 2·1032 cm-2 s-1
Δ p/p ~ 10-4 (stochastic cooling)
High resolution modePmax = 1.5-8 GeV/cLmax 1031 cm-2 s-1
Δ p/p ~ 10-5 (electron cooling)
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STORI’02 Carsten Schwarz
Physics program
Charmoniumspectroscopy
Medium modificationsof D mesons and J/Ψ in nuclei
HypernucleiCP violation
GlueballsHybrids
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STORI’02 Carsten Schwarz
James Ritman Univ. Giessen
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STORI’02 Carsten Schwarz
• Charmonium gives information about QCD confinement potential.
• Many states are still missing.
• pp: direct formation of all states.
• HESR allows investigation of states above DD threshold.
• Cooled beams with Δp/p=10-4…10-5 allow high precision scan of resonances.
Charmoniumspectroscopy
40 keV
Crystal Balle+e-
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STORI’02 Carsten Schwarz
Charmoniumspectroscopy
Crystal Balle+e-
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STORI’02 Carsten Schwarz
GlueballsHybrids
qqg ggg
Hybrid Glueball
Normal meson: 2 fermionsP = (-1)L+1
C = (-1)L+S
Excited glue: bosonic degree of freedom→ exotic quantum numbers eg. JPC=1-+, 0--, 0+-, 2+-…→ normal quantum numbers
Signal:exotic quantum numbers:
partial wave analysisnormal quantum numbers:
model comparison (LGT)
mixing with normal mesonscharm sector: few resonances
with small widths
Meson
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STORI’02 Carsten Schwarz
GlueballsHybrids
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STORI’02 Carsten Schwarz
Medium modificationsof D mesons and J/Ψ in nuclei
Continuation of present GSI physicsFOPI, KAOS, HADES, …HESR
Signal: medium modification ofproduction threshold,resonance widthe.g. Ψ’, χ2
Absorption cross section of J/Ψ in nuclei (ρ=ρ0).
pionic atoms
KAOS/FOPI
HESR
π
K
D
vacuum nuclear mediumρ = ρ0
π+
π-
K-
K+
D+
D-
25 MeV
100 MeV
50 MeV ?
Mass modifications of mesons
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STORI’02 Carsten Schwarz
Hypernuclei
-
3 GeV/c
K+KTrigger
_
secondary target
-(dss) p(uud) (uds) (uds)
study of interaction
p
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STORI’02 Carsten Schwarz
CP violation in Hyperon decay
p + p → Λ +Λ ↓ ↓ pπ- pπ+
• Measure decay asymmetry of angular distribution of p relative to Λ-Hyperon momentum.
• Ip(θp) ~ 1+α cos(θp) for Λ
• Ip(θp) ~ 1+α cos(θp) for Λ
• CP conservation: α = - α
• Signal for CP violation:
Theoretical prediction:
Experiment: 1010 reconstructed ΛΛ
L=2·1032 cm-2 s-1 → >1 year running
5-4- 10 ... 10
A
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STORI’02 Carsten Schwarz
Angular acceptanceFormation of Ψ’ and decay in myons
Ψ’→μ+μ-
Ψ’→J/Ψ + X ↓ μ+μ-
electrons similar→ calorimeter for large angles.
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STORI’02 Carsten Schwarz
HESR Detector
Internal target
forward spectrometertarget spectrometer
Heavy charmed mesons decay inlight products with large pt.Solenoid is important.
top view
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STORI’02 Carsten Schwarz
Particle identification
• Forward angles need π/K separation up to 3 GeV/c: Cherenkov n=1.02
• Backward: higher value of n.
p+p → ΦΦ→ 4K s½ =3.6 GeV
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STORI’02 Carsten Schwarz
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STORI’02 Carsten Schwarz
Tracking, Micro Vertex Detector 7.2 mio. barrel pixels
50 x 300 μm
2 mio. forward pixels100 x 150 μm
beam pipepe
llet
pipe
Readout: ASICs (ATLAS/CMS) 0.37% X0
or pixel one side – readout other side (TESLA)
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STORI’02 Carsten Schwarz
MVD, single track resolution
σD0=51 μm σZ0=82 μm
x
y
zD0
Z0
p p 8.5 GeV
2π+ 2π-
Vertex resolution is sufficient for D-physics
c(D) = 314 μm, c(D0) = 124 μm
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STORI’02 Carsten Schwarz
Target spectrometer, momentum resolution
MVDstraw tubesMDC
pp(s = 4.4 GeV/c2) J/
σM=1.2% ???
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STORI’02 Carsten Schwarz
Particle identification• PID from
– 00<Θ<50 hadronic calorimeter– 50<Θ<220 Aerogel Cherenkov
Counters – 220<Θ<1400 DIRC (BABAR@SLAC)
DIRC thickness: 0.19 X0
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STORI’02 Carsten Schwarz
Particle identification
pp(s = 4.4 GeV/c2) J/
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STORI’02 Carsten Schwarz
Calorimeter
PbWO4
Length = 17 X0
APD readout (in field)σ(E) = 1.54% / E½ + 0.3% (PM)
pp J/Ψ + η γγ
140o
5o
22o
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STORI’02 Carsten Schwarz
e±/π± sep.
electron/pion separation 10-3
2 4 6 8 p (GeV/c)0
Ed
ep (
GeV
/c)
2
4
6
8
10
e+/-
π+
2 4 6 8 p (GeV/c)0
10-3
π+ probability
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STORI’02 Carsten Schwarz
Pellet target
• Frozen hydrogen pellets 20-40μm
• Δx=±1 mm (±0.04o)
• 60 m/s
• 70000 pellets/sec.
• 1014-1016 atoms/cm2 (avg.)
1 mm