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

This study by Marzia Nardi from INFN Torino explores how Color Glass Condensate impacts J/y production in nucleus-nucleus collisions, highlighting the distinct processes in p-p, p-A, and A-A interactions. The research delves into inclusive c-cbar production in hadron-hadron collisions and the behavior of heavy nuclei in the saturation regime. Through calculations based on the Color Glass Condensate model, the analysis reveals insights into the production process of J/y in various collision scenarios, including at RHIC and with different nuclei. The study also discusses time scales and interaction times in collision events. Collaborating with researchers, Nardi shares numerical results and experimental vs. theoretical comparisons to deepen the understanding of these complex interactions.

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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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