Medium-induced soft gluon radiation in DIS

TL;DR

This paper investigates how color coherence influences soft gluon radiation in deep inelastic scattering within a dense QCD medium, highlighting interference effects and their impact on gluon spectra and potential eA collision observables.

Contribution

It provides a first-order opacity expansion calculation of medium-induced soft gluon radiation considering interference effects at finite angles.

Findings

Interference modifies the soft gluon spectrum at finite angles.

Soft divergence appears due to interference effects.

Implications for observables in electron-ion collisions.

Abstract

We study color coherence effects on the medium-induced soft gluon radiation off an asymptotic quark hit by a virtual photon traversing a hot and dense QCD medium. The transverse momentum spectrum of the emitted gluon is computed at 1st order in the opacity expansion. The interference effects between the initial and final state radiation modify the soft gluon spectrum when a finite angle between the incoming and outgoing quarks is considered, presenting a soft divergence. We comment on possible implications on observables in eA collisions.