Lecture 2 on J/  suppression

1. Michel GONIN Lecture 2 on J/ suppression 1. Charmonium bound states 2. Screening effects in the plasma 3. Experimental results 4. Life (for physicist) is tough

2. lD depends on the temperature

3.  quarkonia q q Lattice QCD ’  T > Tc   = 0 Signals for the Deconfinement Successive (vs. temperature) melting for the quarkonia Satz et al.

4. Screening Temperature Energy density(GeV/fm3)ε Suppression  Bounding Energy (MeV) ψ χ ’ ψ’ Quakonia Screening 1 2 3 4 5 ε Satz et al.

5. NA50 at CERN Electromagnetic desintegration c c

7. How does PHENIX see the J/ ? J/  e+e– identified in RICH and EMCal • || < 0.35 • p > 0.2 GeV J/μ+μ– identified in 2 fwd spectrometers • 1.2 < || < 2.4 • p > 2 GeV

9. Cathode-strip chambers = 24000 voies analogiques / bras • Pistes = 1cm s (barycentre) = 100mm Bruit/Signal ~ 1% • ADC 11 bits, 4 échantillons temporels à 100 ns

12. d-Au sample Di-electron analysis Di-muons analysis Mass Resolution ~ 100 MeV Mass Resolution ~ 150 MeV

13. peripheral central NA50 at CERN …

14. Short history of RHIC

15. Ordinary absorption NA50 ANOMALOUS J/ SUPPRESSION

17. Beam EZDC (GeV)

18. With E T With EZCD

19.  ψ χ ’ ψ’ ε 1 2 3 4 5 Suppression Satz et al.

22. NA50  Suppression ψ χ ’ ψ’ Satz et al. ε 1 2 3 4 5

23. NA50 Evidence for ψ χ ψ’ Screening Effects

25. ψ’  Suppression ψ χ ’ ψ’ Satz et al. ε 1 2 3 4 5

27. DECONFINEMENT !!! High Energy Physics Heavy Ion Physics

28. Heavy Ion Physicists Life is tough

30.  not exactely …

31. WITH PLASMA t = 0 c c - Screening effects - hard gluon scattering Deconfinement c c t  2 fm/c mixed phase c d t  5 fm/c c d Hadronization D D Hadronic gas J/ψ J/ψ 10 fm/c  t  20 fm/c Freeze-out

32. S-U Pb-Pb R.Rapp Regeneration : answer from RHIC

33. ψ’  Suppression ψ χ ’ ψ’ Satz et al. ε 1 2 3 4 5

34. Heavy Ion Physicists Life is tough

35. D- D+ CHARMONIA DISSOCIATION J/ p J/ +protons (neutrons) open charm

36. L = path length abs. Glauber absorption model  Rarely produced (no multi-production)  Uniforme (inside the nucleus) production probability • Short ( 1fm/c) formation time • straight line trajectories

37. data model Does it work ?? Yes

38. J/

39. Glauber absorption model

40. Glauber absorption model

41. antiproton CERN :abs. = 21.4  2 mb BNL :abs. = 24.8  3  5 mb

42. Drell-Yan Glauber absorption model Drell-Yan no absorption abs.  0

43. J/

44. J/