Gluon Radiation from a classical point particle II: dense gluon fields

TL;DR

This paper extends previous work on gluon radiation by calculating radiation in dense gluonic fields, identifying components that could lead to observable signals in high-energy nuclear collisions.

Contribution

It introduces a method to compute gluon radiation in dense fields by solving fluctuation equations, expanding understanding beyond dilute field approximations.

Findings

Identified a bulk gluon radiation component in dense fields.

Computed bremsstrahlung contribution potentially observable in experiments.

Provided a simplified gauge approach for solving radiation in dense backgrounds.

Abstract

The goal of this paper is to extend the results of Ref. [1], where formulae were derived for gluonic radiation for a high energy nucleus colliding with a classical colored particle. In Ref. [1], we computed the amplitudes for radiation in the fragmentation region of the particle for a dilute gluonic field. In this paper, we compute the radiation by solving the fluctuation equations of the dense background field in a specific gauge which makes it simple to solve the asymptotic radiation from an initial condition immediately after the passage of the nucleus. We identify and compute two components of gluon radiation, a bulk component which extends to the central region and bremsstrahlung, which may give rise to an experimentally observable intensity peak in the target fragmentation region.