concept of the panda detector for pp&pa at gsi physical motivation for hadron physics with pbars...
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Concept of the PANDA Detector for pp&pA at GSI
• Physical motivation for hadron physics with pbars• The antiproton facility• Detector concept• Selected simulation results• Conclusions
James Ritman Univ. Giessen
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Physical Motivation
1. Quantitative understanding of quark confinement
Charmonium (Bettoni, Koch)
2. Do hadrons other than mesons and baryons exist?
glueballs and/or hybrids (Peters)
3. The mass of hadrons is much larger than the sumof the valence current quark masses. (SBS)
p A interactions4. Nuclear spectroscopy and the study of
baryon-baryon interactions double hypernuclei
(Pochodzalla)• Future options (Poster: Ganzhur&Koch)
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Overview talk by W. Henning
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The GSI p Facility
HESR = High Energy Storage Ring
• Production rate 2x107/sec• Pbeam = 1 - 15 GeV/c• Nstored = 5x1010 p
High luminosity mode• Lumin. = 2x1032 cm-2s-1 • p/p~10-4 (stochastic cooling)
High resolution mode• p/p~10-5 (el. cooling < 8 GeV/c)• Lumin. = 1031 cm-2s-1
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General Purpose Detector
Detector requests:
• nearly 4 solid angle (partial wave analysis)• high rate capability (2107 annihilations/s)• good PID (, e, , , K, p)• momentum resolution (~1%)• vertex info for D, K0
S, cm for D• efficient trigger (e, , K, D, )• modular design (Hypernuclei experiments)
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Detector Concept
target spectrometer forward spectrometer
micro vertexdetector
electromagneticcalorimeter
DIRC:Detecting InternallyReflectedCherenkov light
straw tubetracker
mini driftchambers
muon counter
Solenoidalmagnet
iron yoke
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Target• A fiber/wire target will be needed for D physics,• A pellet target is conceived:
1016 atoms/cm2 for D=20-40 m
1 mm
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MVD
Conversion Prob: ~3%,primary e+e- ~3.6%
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Central Tracking Detectors
example event: pp 4K
• MVD: (Si) 5 layers• Straw-Tubes: 15 skewed double-layers• Mini-Drift-Chambers
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Tracking Resolution
J/ +-
+- (J/ = 35 MeV/c2
( = 3.8 MeV/c2
Example reaction: pp J/ + (s = 4.4 GeV/c2)
Single track resolution
Invariant mass resolution
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PID with DIRC
(DIRC@BaBar)
GEANT4 simulationfor HESR:
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PbWO4 Calorimeter
Length = 17 X0
APD readout (in field)
pp J/
e/-Separation
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Muon Detector
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Performance of Spectrometer
Probability to measure the reaction:
GeV4.4/ sJpp J/ ee J/
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Simulations Framework
Event Generation (FS) DPM pbar + p background
PndEvtGen selected channels
PndSimAppGEANT4 modeling of the detector
PndRecoApptracking, EMC cluster finding, RICH ring
finding,...
PandaApp (FastSim) „user analysis“, PID, spectra, ...
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Summary
• HESR: cooled antiprotons up to 15 GeV/c
• Wide program in hadron physics
• Detector concept
• Selected simulation results
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Pressemitteilung 05.02.2003
Bulmahn gives green light for large-scale research equipment "We are securing an international top position for German basic research"
…
Together with European partners, the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt is to develop further its equipment in a phased approach and become a leading European physics centre. At least 25% of the costs amounting to €675 million are to be shouldered by foreign partners.
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Neutral Vertex Finder
K0S
+
-
-
+ -
Reaction: 2K0s
|D0|>0.4 mm or |Z0|>0.5 mm for each track
Kinematic refit (constraint=common vertex)
3-Momentum conservation
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Forward Spectrometer
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What Can Antiproton Beams Contribute to this
Discussion?Much lower momentum for heavy producedparticles (2GeV for “free”)
(Mass shifts are smaller at high momentum)
Open charm mass region (H atom of QCD) @HESR
(single light quark)
Well defined nuclear environment (T and )