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arXiv · 2508.21719

Gluon emission by a $q\bar{q}$ antenna with realistic parton-medium interactions

Carlota Andres·Liliana Apolinário·Néstor Armesto·André Cordeiro·Fabio Dominguez·Pablo Guerrero-Rodríguez·José Guilherme Milhano
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Abstract

The spectrum of coherent gluon radiation from a quark-anti-quark pair experiencing multiple scatterings within a coloured medium is central for understanding in-medium parton cascades. Despite its foundational importance, current results are limited by reliance on simplified scattering rates, such as the harmonic oscillator approximation, valid only in restricted phase-space regions. Using the formalism introduced in a previous article, we express the gluon emission spectrum as a set of differential equations that can be solved numerically, circumventing conventional approximations. We present the transverse momentum and energy distributions of emitted gluons for realistic interaction models, illustrating the breakdown of colour coherence across the entire accessible phase-space, and consequently enabling a higher-precision description of jet observables.

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Carlota Andres, Liliana Apolinário, Néstor Armesto, André Cordeiro, Fabio Dominguez, Pablo Guerrero-Rodríguez, José Guilherme Milhano. 2025-08-29. Gluon emission by a $q\bar{q}$ antenna with realistic parton-medium interactions. https://arxiv.org/abs/2508.21719

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