Effects of running couplings on jet conversion photons

TL;DR

This paper investigates how running coupling constants affect jet conversion photon production in quark-gluon plasma, showing that dynamic $oldsymbol{oldsymbol{oldsymbol{ ext{α}}}_s}$ significantly alters photon yields and aligns well with experimental data.

Contribution

It introduces a dynamic treatment of the strong coupling constant in jet-photon interaction calculations, improving the modeling of jet quenching and photon production.

Findings

Running coupling significantly modifies the quenching factor.

Model reproduces Phenix data when all sources are included.

Dynamic $oldsymbol{ ext{α}}_s$ impacts photon yield predictions.

Abstract

We calculate photons from jet-plasma interaction considering collisional and radiative energy loss of jet parton. The phase space distribution of the participating jet is dynamically evolved by solving Fokker-Planck equation. We treat the strong coupling constant ($\alpha_s$) as function of momentum and temperature while calculating the drag and diffusion coefficients. It is observed that the quenching factor is substantially modified as compared to the case when $\alpha_s$ is taken as constant. It is shown that the Phenix data is reasonably well reproduced when contributions from all the relevant sources are taken into account.