Heavy quark dynamics in QCD matter

TL;DR

This paper investigates heavy quark behavior in QCD matter, emphasizing the importance of temperature-dependent energy loss and electromagnetic effects to explain experimental observations of suppression and flow.

Contribution

It introduces a detailed analysis of temperature-dependent transport coefficients and solves the Boltzmann equation for heavy quark momentum evolution, including electromagnetic field effects.

Findings

Temperature dependence of drag coefficients impacts suppression and flow.

External electromagnetic fields induce measurable directed flow $v_1(y)$.

Full Boltzmann collision integral solution improves modeling accuracy.

Abstract

Simultaneous description of heavy quark nuclear suppression factor $R_{AA}$ and the elliptic flow $v_2$ is a top challenge for all the existing models. We highlight how the temperature dependence of the energy loss/transport coefficients is responsible to address a large part of such a puzzle along with the the full solution of the Boltzmann collision integral for the momentum evolution of heavy quark. We consider four different models to evaluate the temperature dependence of drag coefficients of the heavy quark in the QGP. We have also highlighted the heavy quark dynamics in the presence of an external electromagnetic field which develops a sizable heavy quark directed flow, $v_1(y)$, can be measurable at LHC.