Heavy quark collisional energy loss in the quark-gluon plasma including finite relaxation time

TL;DR

This paper investigates how finite relaxation time affects the collisional energy loss of heavy quarks in viscous quark-gluon plasma, revealing significant dependence and implications for modeling quark evolution.

Contribution

It introduces the inclusion of finite relaxation time effects in calculating heavy quark energy loss in viscous quark-gluon plasma, highlighting their importance.

Findings

Energy loss varies significantly with relaxation time.

Kinetic theory predicts larger energy loss than AdS/CFT-based estimates.

Finite relaxation time can alter heavy quark evolution models.

Abstract

In this paper, we calculate the soft-collisional energy loss of heavy quarks traversing the viscous quark-gluon plasma including the effects of a finite relaxation time $\tau_\pi$ on the energy loss. We find that the collisional energy loss depends appreciably on $\tau_\pi$ . In particular, for typical values of the viscosity-to-entropy ratio, we show that the energy loss obtained using $\tau_\pi$ = 0 can be $\sim$ 10$\%$ larger than the one obtained using $\tau_\pi$ = 0. Moreover, we find that the energy loss obtained using the kinetic theory expression for $\tau_\pi$ is much larger that the one obtained with the $\tau_\pi$ derived from the Anti de Sitter/Conformal Field Theory correspondence. Our results may be relevant in the modeling of heavy quark evolution through the quark-gluon plasma.