1. 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

2. 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 sum of the valence current quark masses. (SB  S)  p A interactions 4.Nuclear spectroscopy and the study of baryon-baryon interactions  double hypernuclei (Pochodzalla) Future options(Poster: Ganzhur&Koch)

3. Overview talk by W. Henning

4. The GSI p Facility HESR = High Energy Storage Ring Production rate 2x10 7 /sec P beam = 1 - 15 GeV/c N stored = 5x10 10 p High luminosity mode Lumin. = 2x10 32 cm -2 s -1  p/p~10 -4 (stochastic cooling) High resolution mode  p/p~10 -5 (el. cooling < 8 GeV/c) Lumin. = 10 31 cm -2 s -1

5. General Purpose Detector Detector requests: nearly 4  solid angle (partial wave analysis) high rate capability (2  10 7 annihilations/s) good PID ( , e, , , K, p) momentum resolution (~1%) vertex info for D, K 0 S,  c  m for D   efficient trigger (e, , K, D,  ) modular design (Hypernuclei experiments)

6. Detector Concept target spectrometer forward spectrometer micro vertex detector electromagnetic calorimeter DIRC: Detecting Internally Reflected Cherenkov light straw tube tracker mini drift chambers muon counter Solenoidal magnet iron yoke

8. Target A fiber/wire target will be needed for D physics, A pellet target is conceived: 10 16 atoms/cm 2 for D=20-40  m 1 mm

9. MVD Conversion Prob: ~3%, primary e + e - ~3.6%

10. Central Tracking Detectors example event: pp    4K MVD: (Si) 5 layers Straw-Tubes: 15 skewed double-layers Mini-Drift-Chambers

11. Tracking Resolution J/    +  -   +-  +-  (J/  = 35 MeV/c 2  (  = 3.8 MeV/c 2 Example reaction: pp  J/  +  (  s = 4.4 GeV/c 2 ) Single track resolution Invariant mass resolution

12. PID with DIRC (DIRC@BaBar) GEANT4 simulation for HESR:

13. PbWO 4 Calorimeter Length = 17 X 0 APD readout (in field) pp  J/    e/  -Separation

14. Muon Detector

15. Performance of Spectrometer Probability to measure the reaction: J/  ee J/  

16. Simulations Framework Event Generation (FS) DPM pbar + p background PndEvtGen selected channels PndSimApp GEANT4 modeling of the detector PndRecoApp tracking, EMC cluster finding, RICH ring finding,... PandaApp (FastSim) „user analysis“, PID, spectra,...

17. Summary HESR: cooled antiprotons up to 15 GeV/c Wide program in hadron physics Detector concept Selected simulation results

18. Pressemitteilung05.02.2003 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.

19. Neutral Vertex Finder K0SK0S ++ -- -- + -+ - Reaction:     2K 0 s |D0|>0.4 mm or |Z0|>0.5 mm for each track Kinematic refit (constraint=common vertex) 3-Momentum conservation

21. Forward Spectrometer

22. What Can Antiproton Beams Contribute to this Discussion? Much lower momentum for heavy produced particles (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  )