Thermal Bottomonium Suppression at RHIC and LHC

TL;DR

This paper models bottomonium suppression in heavy ion collisions at RHIC and LHC, comparing with experimental data to infer properties of the quark-gluon plasma, including viscosity and temperature.

Contribution

It provides detailed calculations of bottomonium suppression across various states and includes feed down effects, constraining QGP properties from experimental data.

Findings

Suppression patterns match experimental data from STAR and CMS.

Shear viscosity to entropy ratio constrained between 0.08 and 0.24.

Results support the formation of a high-temperature quark-gluon plasma.

Abstract

In this paper we consider the suppression of bottomonium states in ultrarelativistic heavy ion collisions. We compute the suppression as a function of centrality, rapidity, and transverse momentum for the states Upsilon(1s), Upsilon(2s), Upsilon(3s), chi_b1, and chi_b2. Using this information, we then compute the inclusive Upsilon(1s) suppression as a function of centrality, rapidity, and transverse momentum including feed down effects. Calculations are performed for both RHIC sqrt(s_NN)=200 GeV Au-Au collisions and LHC sqrt(s_NN)=2.76 TeV Pb-Pb collisions. From the comparison of our theoretical results with data available from the STAR and CMS Collaborations we are able to constrain the shear viscosity to entropy ratio to be in the range 0.08 < eta/S < 0.24. Our results are consistent with the creation of a high temperature quark-gluon plasma at both RHIC and LHC collision energies.