Abstract
A brief review of recent studies on suppression of bottomonia in an anisotropic quark-gluon plasma created in heavy-ion collisions at the LHC is presented. A reasonable agreement between the model predictions for the inclusive $R_{\rm AA}$ suppression factor and the preliminary CMS experimental data is found. The values of the shear viscosity to the entropy density ratio extracted from the comparison with the data lie between one and two times the gauge/gravity duality lower bound. These values agree very well with the fluid dynamical fits to the light hadron correlation data and confirm that the quark-gluon plasma is a nearly-perfect fluid.
Highlights
One of the main objectives of the ongoing ultra-relativistic heavy-ion collisions (URHIC) studies at the Large Hadron Collider (LHC) in CERN is to produce and extract the properties of a new state of hot nuclear matter called quark-gluon plasma (QGP) [1,2,3]
We use an updated potential-based non-relativistic quantum chromodynamics (QCD) model developed in Refs. [28, 29] coupled to the anisotropic hydrodynamics model for the background evolution constructed in Ref. [30]
The restriction on the values of the shear viscosity to the range 1/(4π) < η/s < 2/(4π) extracted from the comparison to the data agree quite well with the results of the fluid dynamical fits to the light hadron correlation data
Summary
One of the main objectives of the ongoing ultra-relativistic heavy-ion collisions (URHIC) studies at the Large Hadron Collider (LHC) in CERN is to produce and extract the properties of a new state of hot nuclear matter called quark-gluon plasma (QGP) [1,2,3]. Due to their sequential disassociation pattern, they provide a possibility to distinguish between different stages of the QGP evolution [26] In this proceedings contribution we briefly review our main results on the thermal suppression of Υ(1s) and Υ(2s) bottomonium states in an anisotropic QGP created in 2.76 TeV Pb-Pb collisions at the LHC [27]. For this purpose, we use an updated potential-based non-relativistic QCD (pNRQCD) model developed in Refs. The latter confirms creation of an almost perfect QGP at LHC energies
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