1. Heavy quarks and charmonium at RHIC and LHC within a partonic transport model Jan Uphoff with O. Fochler, Z. Xu and C. Greiner XLIX International Winter Meeting on Nuclear Physics Bormio, 23-29 January 2011 based on arXiv:1003.4200, 1004.4091, 1008.1995 & 1011.6183

2. 1Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Outline Motivation Heavy quark processes in BAMPS Heavy quark production in heavy-ion collisions Elliptic flow and energy loss of heavy quarks J/ψ production Summary

3. 2Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy-ion collision at LHC BAMPS simulation of QGP phase at LHC at s NN = 2.76 TeV Visualization framework courtesy MADAI collaboration, funded by the NSF under grant# NSF- PHY-09-41373

4. 3Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Motivation Large heavy quark mass >> Λ QCD Charm: M c ≈ 1.5 GeV Bottom: M b ≈ 4.75 GeV D c c _ D _ Heavy quark production at early stage of collision ideal probe for this stage Pre-equil. phase

5. 4Jan Uphoff Heavy quarks and charmonium at RHIC and LHC BAMPS BAMPS: Boltzmann Approach of MultiParton Scatterings 3+1 dimensional, fully dynamic parton transport model solves the Boltzmann equations for on-shell partons with pQCD interactions Z. Xu & C. Greiner, Phys. Rev. C71 (2005) Phys. Rev. C76 (2007) Implemented processes: Light quarks are currently being implemented

6. 5Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Sketch of heavy-ion collision in BAMPS QGP Heavy flavor in BAMPS

7. 6Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Sketch of heavy-ion collision in BAMPS QGP Hadronic phase No interactions taken into account Heavy flavor in BAMPS

8. 7Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Sketch of heavy-ion collision in BAMPS QGP Hadronic phase No interactions taken into account Initial hard parton scatterings Heavy flavor in BAMPS

9. 8Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Sketch of heavy-ion collision in BAMPS QGP Hadronic phase No interactions taken into account J/ ψ c c Initial hard parton scatterings Energy loss c Charm production c _ c _ c _ Heavy flavor in BAMPS

10. 9Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Sketch of heavy-ion collision in BAMPS QGP Hadronic phase No interactions taken into account J/ ψ c c c Initial hard parton scatterings Energy loss J/ ψ regeneration J/ ψ dissociation c Charm production c _ c _ c _ c _ Heavy flavor in BAMPS

11. 10Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Sketch of heavy-ion collision in BAMPS QGP Hadronic phase No interactions taken into account D D D D J/ ψ e c c c Initial hard parton scatterings Energy loss J/ ψ regeneration J/ ψ dissociation D D c Charm production c _ c _ c _ c _ Heavy flavor in BAMPS

12. 11Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Initial conditions  NLO pQCD Distributions from R. Vogt  PYTHIA Monte Carlo Event Generator for nucleon-nucleon collisions Heavy quarks:  PYTHIA scaling to heavy-ion collisions with Glauber model (considering shadowing) and energy conservation  Minijets (low p T cut-off at 1.4 GeV)  Color glass condensate H.J. Drescher & Y. Nara, Phys. Rev. C75 (2007) Gluons:

13. 12Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Charm production in the QGP at LHC BAMPS charm pairs LHC Large secondary production → Can even be comparable to initial production charm pairs November run JU, Fochler, Xu, Greiner Phys. Rev. C 82 (2010)

14. 13Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Elliptic flow v 2 & nuclear modification factor R AA Elliptic flow Nuclear modifaction factor

15. 14Jan Uphoff Heavy quarks and charmonium at RHIC and LHC v 2 and R AA for gluons O. Fochler, Z. Xu & C. Greiner, Phys.Rev.Lett.102 (2009) central Au+Au Z. Xu & C. Greiner, Phys. Rev. C 79 (2009) RHIC

16. 15Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark elliptic flow v 2 at RHIC only elastic heavy quark processes PHENIX data, arXiv:1005.1627 RHIC

17. 16Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark elliptic flow v 2 at RHIC only elastic heavy quark processes RHIC PHENIX data, arXiv:1005.1627

18. 17Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark scattering Leading order perturbative QCD: t channel is divergent for small t can be fixed to A. Peshier, arXiv:0801.0595 [hep-ph] P.B. Gossiaux, J. Aichelin, Phys.Rev.C78 (2008) by comparing dE/dx to HTL result beyond logarithmic accuracy Introduce a running coupling constant for all channels

19. 18Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark elliptic flow v 2 at RHIC only elastic heavy quark processes PHENIX, arXiv:1005.1627 RHIC

20. 19Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark R AA at RHIC only elastic heavy quark processes PHENIX, arXiv:1005.1627 RHIC

21. 20Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark elliptic flow v 2 at RHIC only elastic heavy quark processes PHENIX, arXiv:1005.1627 LHC

22. 21Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark R AA at RHIC only elastic heavy quark processes PHENIX, arXiv:1005.1627 LHC

23. 22Jan Uphoff Heavy quarks and charmonium at RHIC and LHC J/ψ suppression Cold nuclear matter effects  Shadowing  Cronin effect  Nuclear absorption Hot nuclear matter effects  J/psi dissociation  If T > T d = 2 T c = 330 MeV  Via  J/psi regeneration via Bhanot+Peskin 79

24. 23Jan Uphoff Heavy quarks and charmonium at RHIC and LHC J/ψ production

25. 24Jan Uphoff Heavy quarks and charmonium at RHIC and LHC J/ψ production

26. 25Jan Uphoff Heavy quarks and charmonium at RHIC and LHC J/ψ production

27. 26Jan Uphoff Heavy quarks and charmonium at RHIC and LHC J/ψ production

28. 27Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Conclusions & outlook Future tasks: Radiative corrections for heavy quark scattering Light quarks Small charm yield during QGP phase at RHIC, not necessarily negligible at LHC LO gluon heavy quark scattering is not sufficient to build up collective flow and R AA Running coupling and improved Debye screening yield results closer to data J/  yield smaller than data Full space-time evolution of QGP with charm and bottom quarks and J/  Further details on arXiv:1003.4200, 1004.4091, 1008.1995 & 1011.6183

29. 28Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Thank you for your attention.

30. 29Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark R AA at RHIC only elastic heavy quark processes PHENIX, arXiv:1005.1627

31. 30Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark scattering cross section

32. 31Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark elliptic flow v 2 at RHIC When does the elliptic flow build up?

33. 32Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Initial conditions for cascade at LHC In agreement with most of LHC predictions (cf. N. Armesto, J.Phys.G35 (2008)

34. 33Jan Uphoff Heavy quarks and charmonium at RHIC and LHC Heavy quark scattering Introduce a running coupling constant for all channels Compare to analytic formula