1. 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 luminosity mode P max = 1.5-15 GeV/c L max < 2·10 32 cm -2 s -1 Δ p/p ~ 10 -4 (stochastic cooling) 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)

2. STORI’02Carsten Schwarz Physics program Charmonium spectroscopy Medium modifications of D mesons and J/Ψ in nuclei Hypernuclei CP violation Glueballs Hybrids

3. STORI’02Carsten Schwarz

4. STORI’02Carsten 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. Charmonium spectroscopy 40 keV Crystal Ball e + e -

5. STORI’02Carsten Schwarz Charmonium spectroscopy Crystal Ball e + e -

6. STORI’02Carsten Schwarz Glueballs Hybrids qqg ggg HybridGlueball Normal meson: 2 fermions P = (-1) L+1 C = (-1) L+S Excited glue: bosonic degree of freedom → exotic quantum numbers eg. J PC =1 -+, 0 --, 0 +-, 2 +- … → normal quantum numbers Signal: exotic quantum numbers: partial wave analysis normal quantum numbers: model comparison (LGT) mixing with normal mesons charm sector: few resonances with small widths qq Meson

7. STORI’02Carsten Schwarz Glueballs Hybrids

8. STORI’02Carsten Schwarz Medium modifications of D mesons and J/Ψ in nuclei Continuation of present GSI physics FOPI, KAOS, HADES, …HESR Signal: medium modification of production threshold, resonance width e.g. Ψ’, χ 2 Absorption cross section of J/Ψ in nuclei (ρ=ρ 0 ). pionic atoms KAOS/FOPI HESR π K D vacuumnuclear medium ρ = ρ 0 π+π+ π-π- K-K- K+K+ D+D+ D-D- 25 MeV 100 MeV 50 MeV ? Mass modifications of mesons

9. STORI’02Carsten Schwarz Hypernuclei -- 3 GeV/c K+K Trigger _  secondary target  - (dss) p(uud)   (uds)  (uds) study of  interaction p

10. STORI’02Carsten Schwarz CP violationin Hyperon decay p + p → Λ +Λ ↓ ↓ pπ - pπ + Measure decay asymmetry of angular distribution of p relative to Λ-Hyperon momentum. I p (θ p ) ~ 1+α cos(θ p ) for Λ CP conservation: α = - α Signal for CP violation: Theoretical prediction: Experiment: 10 10 reconstructed ΛΛ L=2·10 32 cm -2 s -1 → >1 year running

11. STORI’02Carsten Schwarz Angular acceptance Formation of Ψ’ and decay in myons Ψ’→μ + μ - Ψ’→J/Ψ + X ↓ μ + μ - electrons similar → calorimeter for large angles.

12. STORI’02Carsten Schwarz HESR Detector Internal target forward spectrometertarget spectrometer Heavy charmed mesons decay in light products with large p t. Solenoid is important. top view

13. STORI’02Carsten 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 s ½ =3.6 GeV

14. STORI’02Carsten Schwarz

15. STORI’02Carsten Schwarz Tracking, Micro Vertex Detector 7.2 mio. barrel pixels 50 x 300 μm 2 mio. forward pixels 100 x 150 μm beam pipe pellet pipe Readout: ASICs (ATLAS/CMS) 0.37% X 0 or pixel one side – readout other side (TESLA)

16. STORI’02Carsten Schwarz MVD, single track resolution σ D0 =51 μm σ Z0 =82 μm x y z D0D0 Z0Z0 p 8.5 GeV 2π + 2π - Vertex resolution is sufficient for D-physics c  (D  ) = 314 μm, c  (D 0 ) = 124 μm

17. STORI’02Carsten Schwarz Target spectrometer, momentum resolution MVD straw tubes MDC pp(  s = 4.4 GeV/c 2 )  J/  σ M = 1.2% ???

18. STORI’02Carsten Schwarz Particle identification PID from –0 0 <Θ<5 0 hadronic calorimeter –5 0 <Θ<22 0 Aerogel Cherenkov Counters –22 0 <Θ<140 0 DIRC (BABAR@SLAC) DIRC thickness: 0.19 X 0

19. STORI’02Carsten Schwarz Particle identification pp(  s = 4.4 GeV/c 2 )  J/ 

20. STORI’02Carsten Schwarz Calorimeter PbWO 4 Length = 17 X 0 APD readout (in field) σ(E) = 1.54% / E ½ + 0.3% (PM) pp  J/Ψ + η γγ 140 o 5o5o 22 o

21. STORI’02Carsten Schwarz e ± /π ± sep. electron/pion separation  10 -3 2468 p (GeV/c) 0 E dep (GeV/c) 2 4 6 8 10 e +/- π+π+ 2468p (GeV/c)0 10 -3 π + probability

22. STORI’02Carsten Schwarz Pellet target Frozen hydrogen pellets 20- 40μm Δx=±1 mm (±0.04 o ) 60 m/s 70000 pellets/sec. 10 14 -10 16 atoms/cm 2 (avg.) 1 mm