Bottomonia suppression in an anisotropic quark-gluon plasma

TL;DR

This paper reviews recent research on bottomonia suppression in an anisotropic quark-gluon plasma, showing model predictions align with experimental data and supporting the nearly-perfect fluid nature of the plasma.

Contribution

It provides a comparison of suppression models with LHC data and estimates the shear viscosity to entropy density ratio of the quark-gluon plasma.

Findings

Model predictions agree with CMS data on bottomonia suppression.

Estimated shear viscosity to entropy density ratio is between 1 and 2 times the lower bound.

Results support the quark-gluon plasma being a nearly-perfect fluid.

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.