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Lecture 2 on J/  suppression

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. l D depends on the temperature. . quarkonia. q. q. Lattice QCD.  ’. . T > T c. .  = 0.

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Lecture 2 on J/  suppression

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  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

  6. 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

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

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

  9. peripheral central NA50 at CERN …

  10. Short history of RHIC

  11. Ordinary absorption NA50 ANOMALOUS J/ SUPPRESSION

  12. Beam EZDC (GeV)

  13. With E T With EZCD

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

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

  16. NA50 Evidence for ψ χ ψ’ Screening Effects

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

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

  19. Heavy Ion Physicists Life is tough

  20.  not exactely …

  21. 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

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

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

  24. Heavy Ion Physicists Life is tough

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

  26. 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

  27. data model Does it work ?? Yes

  28. J/

  29. Glauber absorption model

  30. Glauber absorption model

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

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

  33. J/

  34. J/

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