Transport coefficients of the heavy quark in the domain of the non-perturbative and non-eikonal gluon radiation

TL;DR

This paper calculates the drag and diffusion coefficients of heavy quarks in a non-perturbative QCD medium, incorporating non-eikonal gluon radiation effects to better understand experimental observations in heavy ion collisions.

Contribution

It introduces a novel calculation of heavy quark transport coefficients considering non-eikonal gluon radiation using the Gribov mechanism, extending beyond perturbative approaches.

Findings

Transport coefficients increase with non-eikonality.

Results differ significantly from perturbative and eikonal models.

Enhanced coefficients help explain experimental data on $R_{AA}$ and $v_2$.

Abstract

Drag and diffusion coefficients of the Heavy Quarks (HQs), such as charm and bottom, are one of the prime tools for discerning the properties of the deconfined QCD medium created in the Heavy Ion Collisions experiments. The innate non-perturbative nature of the QCD medium renders it imperative to estimate the transport coefficients in that domain. The present work evaluates the drag and diffusion coefficients of the moving HQ interacting with the medium particles via two-body collisional and three-body radiative processes to the first order in opacity by employing Gribov mechanism for the non-perturbative regime. We proffer the latest results of the HQ transport coefficients computed for the non-perturbative and non-eikonal gluon radiation off the HQ. The calculations show significant increment of the transport coefficients with the increasing non-eikonality by juxtaposing the results with those of the pertubative and eikonal regions. We hope to shed fresh light towards explaining the experimental data on the nuclear modification facor, $R_{AA}$, the elliptic flow, $v_2$ of the HQ by advocating the importance of the non-eikonality of the gluon radiation off the HQ.