Flow Effects on Jet Energy Loss with Detailed Balance

TL;DR

This paper models how collective flow in a medium influences jet energy loss and quenching, revealing that flow reduces overall energy loss and impacts high-energy collision observables.

Contribution

It introduces a new potential model incorporating collective flow effects into jet-medium interactions within pQCD, highlighting the impact on jet quenching.

Findings

Flow decreases LPM destructive interference.

Gluon absorption becomes more significant in moving medium.

Total energy loss is reduced by collective flow.

Abstract

In the presence of collective flow a new model potential describing the interaction of the hard jet with scattering centers is derived based on the static color-screened Yukawa potential. The flow effect on jet quenching with detailed balance is investigated in pQCD. It turns out, considering the collective flow with velocity $v_z$ along the jet direction, the collective flow decreases the LPM destructive interference comparing to that in the static medium. The gluon absorption plays a more important role in the moving medium. The collective flow increases the energy gain from gluon absorption, however, decreases the energy loss from gluon radiation, which is $(1 - v_z )$ times as that in the static medium to the first order of opacity. In the presence of collective flow, the second order in opacity correction is relatively small compared to the first order. So that the total effective energy loss is decreased. The flow dependence of the energy loss will affect the suppression of high $p_T$ hadron spectrum and anisotropy parameter $v_2$ in high-energy heavy-ion collisions.