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arXiv · 2605.12791

Jet Momentum Broadening in Viscous QCD Matter: A Moment Expansion Approach

Isabella Danhoni·Nicki Mullins·Jorge Noronha
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Abstract

We formulate out-of-equilibrium jet momentum broadening in QCD effective kinetic theory through a moment expansion of the medium distribution function, a method traditionally used to derive relativistic viscous hydrodynamics from kinetic theory. We explicitly compute the leading near-equilibrium contribution to the spatial jet broadening tensor $\hat q^{ij}$ within the 14-moment approximation, and show that it is controlled by the medium shear-stress tensor. This provides a direct map from QCD effective kinetic theory to event-by-event viscous hydrodynamic simulations, converting local shear-stress fields into anisotropic corrections to jet broadening in heavy-ion collisions.

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Isabella Danhoni, Nicki Mullins, Jorge Noronha. 2026-05-12. Jet Momentum Broadening in Viscous QCD Matter: A Moment Expansion Approach. https://arxiv.org/abs/2605.12791

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