Onset of color decoherence for soft gluon radiation in medium

TL;DR

This paper investigates how dense QCD media cause color decoherence in jet radiation, leading to independent emissions from antenna constituents and a loss of coherence in the radiation pattern.

Contribution

It provides a detailed analysis of the onset of color decoherence in medium-induced gluon radiation, highlighting the transition to independent emissions in opaque media.

Findings

Color decoherence occurs due to multiple scatterings in the medium.

In opaque media, antenna constituents radiate independently.

Radiation off the total charge vanishes in the decoherence limit.

Abstract

We report on recent studies of the phenomenon of color decoherence in jets in QCD media. The effect is most clearly observed in the radiation pattern of a quark-antiquark antenna, created in the same quantum state, traversing a dense color deconfined plasma. Multiple scattering with the medium color charges gradually destroys the coherence of the antenna. In the limit of opaque media this ultimately leads to independent radiation off the antenna constituents. Accordingly, radiation off the total charge vanishes implying a memory loss effect induced by the medium.