Effect of running coupling on photon emission from quark gluon plasma

TL;DR

This paper investigates how the running coupling affects photon emission rates from quark-gluon plasma, showing significant theoretical enhancement but limited experimental distinguishability when combined with hard contributions.

Contribution

It demonstrates the impact of running coupling on photon production rates and compares it with fixed coupling models in the context of quark-gluon plasma.

Findings

Photon yield is significantly enhanced with running coupling.

Experimental data cannot distinguish between running and fixed coupling models.

Hard contributions dominate photon production, masking coupling effects.

Abstract

We discuss the role of running coupling on the thermal photon yield from quark gluon plasma. It is shown that the photon production rate from the partonic phase is considerably enhanced when running coupling is considered with respect to a fixed value. However, we show by explicit evaluation that although this difference survives the space-time evolution the experimental data cannot distinguish between the two once the hard contribution, which is an essential component of photon production mechanism, is added.