Bremsstrahlung photon from a hadronizing quark-gluon plasma

TL;DR

This paper calculates Bremsstrahlung photons emitted during the hadronization of a quark-gluon plasma, revealing increased photon production in low-energy and peripheral heavy-ion collisions.

Contribution

It introduces a method to compute Bremsstrahlung photons from a hadronizing QGP using conservation constraints and statistical models, highlighting their significance in specific collision conditions.

Findings

Bremsstrahlung photon contribution increases in low-energy collisions.

Enhanced photon emission observed in peripheral collisions.

Method links hadronization dynamics to photon production.

Abstract

Assuming that quark and antiquark numbers are separately conserved during hadronization, we calculate Bremsstrahlung photon from a hadronizing quark-gluon plasma. The quark and antiquark numbers are obtained from the hadron numbers in the statistical model and the transition amplitudes for the hadronization from the constraint that all quarks and antiquarks must be consumed in the hadronization. Then Bremsstrahlung photon from the hadronization is obtained in the soft photon approximation, and we find that its contribution to the direct photon increases in low-energy heavy-ion collisions and in peripheral collisions where the lifetime of a quark-gluon plasma (QGP) is relatively short.