STORI’02 Carsten Schwarz Physics with p at the Future GSI Facility • Physics program • Detector set-up p e - cooler detector High Energy Storage Ring HESR High luminosity mode P max = 1.5-15 GeV/c L max < 2·10 32 cm -2 s -1 Δ p/p ~ 10 -4 (stochastic coolin High resolution mode P max = 1.5-8 GeV/c L max 10 31 cm -2 s -1 Δ p/p ~ 10 -5 (electron cooling
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STORI’02Carsten Schwarz Physics with p at the Future GSI Facility Physics program Detector set-up p e - coolerdetector High Energy Storage Ring HESR High.
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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)
STORI’02 Carsten Schwarz
Physics program
Charmoniumspectroscopy
Medium modificationsof D mesons and J/Ψ in nuclei
HypernucleiCP violation
GlueballsHybrids
STORI’02 Carsten Schwarz
James Ritman Univ. Giessen
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-
STORI’02 Carsten Schwarz
Charmoniumspectroscopy
Crystal Balle+e-
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
qq
Meson
STORI’02 Carsten Schwarz
GlueballsHybrids
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
STORI’02 Carsten Schwarz
Hypernuclei
-
3 GeV/c
K+KTrigger
_
secondary target
-(dss) p(uud) (uds) (uds)
study of interaction
p
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
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.
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
STORI’02 Carsten Schwarz
Particle identification
• Forward angles need π/K separation up to 3 GeV/c: Cherenkov n=1.02