Coherence and broadening effects in medium induced gluon radiation

TL;DR

This paper derives how a hot QCD medium modifies gluon radiation patterns from quarks, highlighting interference effects that impact jet behavior in heavy-ion collisions.

Contribution

It introduces a first-order calculation of medium-induced gluon emission including interference effects between initial and final quarks, advancing understanding of jet quenching.

Findings

Modified gluon distribution due to interference effects

Potential impact on jet observables in heavy-ion collisions

New theoretical framework for medium-induced radiation

Abstract

Interferences between different emitters in the multi-parton shower is the building block of QCD jet physics in vacuum. The presence of a hot medium made of quarks and gluons is expected to alter this interference pattern. To study such effects, we derive the gluon emission spectrum off an "asymptotic quark" traversing a hot and dense QCD medium at first order in the medium density. The resulting induced gluon distribution gets modified when the new interference terms between the initial and final quark are included. We comment on the possible phenomenological consequences of this new contribution for jet observables in heavy-ion collisions.