Non-perturbative production rate of photons with a lattice quark propagator: effect of vertex correction

TL;DR

This paper calculates the photon production rate in a quark-gluon plasma using a lattice-derived quark propagator and a gauge-invariant vertex, revealing suppression relative to perturbative predictions.

Contribution

It introduces a non-perturbative approach with a lattice-based quark propagator and a gauge-invariant vertex to evaluate photon production rates.

Findings

Photon production rate is suppressed compared to perturbative results.

Gauge-invariant vertex satisfies Ward-Takahashi identity.

Non-perturbative effects significantly impact photon emission rates.

Abstract

We analyze the production rate of photons from the thermal medium above the deconfinement temperature with a quark propagator obtained from a lattice QCD numerical simulation. The photon-quark vertex is determined gauge-invariantly, so as to satisfy the Ward-Takahashi identity. The obtained photon production rate shows a suppression compared to perturbative results.