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Effects of Color Glass Condensate on J/ y production in nucleus-nucleus collisions

Quark Matter 2008, Jaipur Feb 5, 2008 (parallel session VI). Effects of Color Glass Condensate on J/ y production in nucleus-nucleus collisions. Marzia Nardi INFN Torino (Italy). Work done in collaboration with: D. Kharzeev (BNL) E. Levin (Tel Aviv Univ.)

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Effects of Color Glass Condensate on J/ y production in nucleus-nucleus collisions

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  1. Quark Matter 2008, Jaipur Feb 5, 2008(parallel session VI) Effects of Color Glass Condensate on J/y productionin nucleus-nucleus collisions Marzia Nardi INFN Torino (Italy)

  2. Work done in collaboration with: D. Kharzeev (BNL) E. Levin (Tel Aviv Univ.) K. Tuchin (Iowa St. Univ. & RIKEN BNL) in preparation Extension of: D.Kharzeev and K.Tuchin Nucl.Phys. A 770(2006) 40 [arXiv:hep-ph/0510358] Marzia Nardi, INFN Torino

  3. p-p vs p-A In the saturation regime :as2A1/3~1 for heavy nuclei the second process is dominant. Two different processes are responsible for J/y production in p-p and p-A/A-A (A heavy) [depending on y] p-A : as6A1/3 p-p : as5 Marzia Nardi, INFN Torino

  4. p-A : results D.Kharzeev and K.Tuchin Nucl.Phys. A 770(2006) 40 [arXiv:hep-ph/0510358] Marzia Nardi, INFN Torino

  5. Inclusive c-cbar production in hadron-hadron collisions Marzia Nardi, INFN Torino

  6. Inclusive c-cbar production in hadron-hadron collisions Dipole-hadron interaction: Marzia Nardi, INFN Torino

  7. Hadron-(heavy)nucleus collisions p-p p-A Marzia Nardi, INFN Torino

  8. Hadron-(heavy)nucleus collisions Marzia Nardi, INFN Torino

  9. Hadron-(heavy)nucleus collisions In the saturation regime: If Qs>>mc : In hadron-hadron: Marzia Nardi, INFN Torino

  10. A-A collisions at RHIC Marzia Nardi, INFN Torino

  11. A-A collisions at RHIC Marzia Nardi, INFN Torino

  12. In p-p collisions this ratio is more flat (away from fragmentation regions) Marzia Nardi, INFN Torino

  13. J/y production: p-A Marzia Nardi, INFN Torino

  14. J/y production: p-A Marzia Nardi, INFN Torino

  15. J/y production: A-A Marzia Nardi, INFN Torino

  16. J/y production: A-A In the saturation region: Marzia Nardi, INFN Torino

  17. Numerical results for Au-Au @RHIC Marzia Nardi, INFN Torino

  18. Data: PHENIX Collab.[PRL 98:232301,2007] Marzia Nardi, INFN Torino

  19. Experiment / Theory Experiment / Theory Experiment / Theory Experiment / Theory Marzia Nardi, INFN Torino

  20. Marzia Nardi, INFN Torino

  21. Summary & Outlook The production process of J/y in p-A and A-A is different from p-p: initial state effects are important. Calculations based on CGC can reproduce y and b dependence of J/y in Au-Au at RHIC. Some uncertainty in absolute normalization, leaving room for final state suppression (to be fixed by comparison with p(d)-Au data). Next: study of lighter systems (Cu-Cu), pT distribution. Marzia Nardi, INFN Torino

  22. back-up slides

  23. Time scales • tp = c-cbar production time • in the pair rest frame tp0 = 1/2mc . • in the nucleus rest frame (g=Eg/2mc) : tp=Eg/(2mc)2 Eg = x1 Ep s=(x1pp+x2pt)2=2x1x2EpM=2x2EgM s=(2mc)2 tp =1/(2x2M) x2=mce-y/sqrt(s) at RHIC : x2=6.5x10-3 e-y tp =15 ey fm Marzia Nardi, INFN Torino

  24. tint = interaction time = RA/c at high energies tp > tint or lc=tp c > RA tp =15 ey fm : at forward y tp is very large • the projectile interacts with the whole nucleus • eikonal approximation for the calculation of scattering amplitude Marzia Nardi, INFN Torino

  25. tf = J/y formation time • in the pair rest frame tf0= 2/(my’-my) • in the nucleus rest frame (g=Eg/My) : tf = 2Eg/(my’-my) My • tf0=0.45 fm  tfRHIC=41 ey fm Marzia Nardi, INFN Torino

  26. Inclusive c-cbar prodution in hadron-hadron collisions Marzia Nardi, INFN Torino

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