Interference effects in medium-induced gluon radiation

TL;DR

This paper investigates how interference effects influence medium-induced gluon radiation from a quark-antiquark pair in a QCD medium, revealing conditions under which emissions are suppressed or additive, impacting jet quenching understanding.

Contribution

It provides a detailed analysis of interference effects in medium-induced gluon radiation for a quark-antiquark antenna, highlighting the dependence on dipole opening angle and coherence times.

Findings

Interference is suppressed for large dipole angles ( heta_{qar q} > heta_c).

Medium-induced radiation becomes a sum of individual emissions for large angles.

Radiation vanishes for small dipole angles ( heta_{qar q} << heta_c).

Abstract

As a step towards understanding the in-medium evolution of a hard jet, we consider the interference pattern for the medium induced gluon radiation produced by a color singlet quark-antiquark antenna embedded in a QCD medium with size L. We focus on the typical kinematics for medium-induced gluon radiation in the BDMPS-Z regime, that is, short formation times \tau_f << L and relatively large emission angles \theta >>\theta_c = 2/\sqrt{\hat q L^3}, with \hat q the `jet quenching' parameter. We demonstrate that, for a dipole opening angle \theta_{q\bar q} larger than \theta_c, the interference between the medium-induced gluon emissions by the quark and the antiquark is parametrically suppressed with respect to the corresponding direct emissions. Physically, this is so since the direct emissions can be delocalized anywhere throughout the medium and thus yield contributions proportional to L. On the contrary, the interference occurs only between gluons emitted at very early times, within the characteristic time scales for quantum and color coherence between the two emitters, which in this regime are much smaller than L. This implies that, for \theta_{q\bar q} >> \theta_c, the medium-induced radiation by the dipole is simply the sum of the two BDMPS-Z spectra individually produced by the quark and the antiquark, without coherence effects like angular ordering. For \theta_{q\bar q} << \theta_c, the BDMPS-Z radiation by the dipole vanishes.