Medium effects on bottomonia suppression in relativistic heavy ion collisions, T. Song; Cyclotron Institute, Texas A&M university, College Station,Texas USA − Understanding bottomonia production in relativistic heavy ion collisions provides the possibility to study the properties of bottomonia in the produced quark-gluon plasma.  To achieve this goal, we have recently studied bottomonia production in a 2+1 ideal hydrodynamic model with an equation of state given by the quasiparticle model for the quark-gluon phase and the resonance gas model for the hadronic phase [1].  The in-medium properties of bottomonia in the quark-gluon plasma such as their binding energies and radii were determined from the screened Cornell potential, while their dissociation cross sections by quarks and gluons in the quark-gluon plasma were calculated using the perturbative QCD to the next-to-leading order [2].  We found that the inclusion of these medium effects was helpful for understanding the centrality dependence of the suppressed production of bottomonia observed in experiments carried out at both the Relativistic Heavy Ion Collidder (RHIC) and the Large Hadron Collider (LHC) [3].  Including the initial temperature fluctuation in the produced quark-gluon plasma, it was further found that while the yield of the 1S ground state bottomonium was hardly affected, the survival probability of excited bottomonia was reduced at low transverse momentum and enhanced at high transverse momentum in comparison to the case with a smooth initial temperature distribution [4]. 

 

[1] T. Song, W. Park, and S. H. Lee, Phys. Rev. C 84, 054903 (2011).

[2] T. Song, Y. Park, S. H. Lee, and C. Y. Wong, Phys. Lett. B 659, 621 (2008).

[3] T. Song, K. C. Han, and C. M. Ko, arXiv:1109.6691 [nucl-th].

[4] T. Song, K. C. Han, and C. M. Ko, arXiv:1112.0313 [nucl-th].