Radiation of an electric charge in the field of a magnetic monopole

TL;DR

This paper investigates photon radiation from quark-monopole scattering in the Quark-Gluon Plasma, finding it may significantly contribute to dilepton production in heavy-ion collisions, especially at high temperatures.

Contribution

It introduces a classical, non-relativistic calculation of photon emission from quark-monopole scattering, highlighting its potential importance over Coulomb scattering in QGP.

Findings

Quark-monopole scattering dominates photon emission rates.

Results are sensitive to quark and monopole densities.

Study provides initial insights into monopole contributions to dilepton production.

Abstract

We consider the radiation of photons from quarks scattering on color-magnetic monopoles in the Quark-Gluon Plasma. We consider a temperature regime $T\gsim2T_c$, where monopoles can be considered as static, rare objects embedded into matter consisting mostly of the usual "electric" quasiparticles, quarks and gluons. The calculation is performed in the classical, non-relativistic approximation and results are compared to photon emission from Coulomb scattering of quarks, known to provide a significant contribution to the photon emission rates from QGP. The present study is a first step towards understanding whether this scattering process can give a sizeable contribution to dilepton production in heavy-ion collisions. Our results are encouraging: by comparing the magnitudes of the photon emission rate for the two processes, we find a dominance in the case of quark-monopole scattering. Our results display strong sensitivity to finite densities of quarks and monopoles.