On the momentum broadening of in-medium jet evolution using a light-front Hamiltonian approach

TL;DR

This paper introduces a non-perturbative light-front Hamiltonian approach to simulate and analyze the transverse momentum broadening of in-medium quark jets, providing new insights beyond the eikonal approximation.

Contribution

It develops a novel non-perturbative formalism and analytical methods to study jet momentum broadening in a medium, extending understanding beyond traditional eikonal limits.

Findings

Numerical simulation of quark jet evolution at various medium densities.

Extraction of gluon emission rate and non-eikonal quenching parameter.

Analytical derivation of the eikonal expectation value for transverse momentum.

Abstract

We have developed a non-perturbative light-front Hamiltonian formalism to simulate the real-time evolution of a quark state in a SU(3) colored medium, with a series of works. In this proceeding article, we focus on the transverse momentum broadening of an in-medium quark jet. We perform the numerical simulation of the quark jet evolution in the $\ket{q}+\ket{qg}$ Fock space at various medium densities. By analyzing the resulting jet light-front wavefunction, we extract the gluon emission rate and the non-eikonal quenching parameter. Additionally, we provide the analytical derivation of the eikonal expectation value of the quark-gluon state's transverse momentum for any color configuration and arbitrary spatial distribution. This study can help understand jet momentum broadening beyond the eikonal limit.