In-medium antenna radiation in t-channel

TL;DR

This paper investigates how a dilute QCD medium affects initial state radiation from a hard quark, revealing modifications in the gluon radiation spectrum and angular distribution due to interference effects.

Contribution

It provides a novel analysis of medium-induced gluon radiation considering interference effects between incoming and outgoing quarks at finite angles.

Findings

Interference effects alter the angular distribution of gluon radiation.

Medium modifies the gluon radiation spectrum compared to vacuum.

Finite scattering angles significantly impact the radiation pattern.

Abstract

The color coherence effects in the medium modification to the initial state radiation are studied via a simple setup which allows these effects to be pronounced. The medium-induced gluon radiation spectrum off a hard quark which suffers a highly virtual photon scattering and subsequently crosses a dilute QCD medium of finite size is obtained. The angular distribution of the medium-induced gluon radiation spectrum is modified when the interference contributions between the incoming and outgoing quarks at a finite scattering angle are included.