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    Nonlocal high-pt transport in anisotropic QCD matter

    João Barata1,*, Xiaojian Du2,†, and Andrey V. Sadofyev3,‡

    • 1CERN, Theoretical Physics Department, CH-1211 Geneva 23, Switzerland
    • 2Instituto Galego de Física de Altas Enerxías, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Galicia, Spain
    • 3LIP, Avenida Professor Gama Pinto, 2, P-1649-003 Lisboa, Portugal

    • *Contact author: joao.lourenco.henriques.barata@cern.ch
    • †Contact author: xiaojian.du@usc.es
    • ‡Contact author: sadofyev@lip.pt

    Phys. Rev. D 111, 114017 – Published 20 June, 2025

    DOI: https://doi.org/10.1103/25qf-3l1c

    Abstract

    We perform a numerical study of nonlocal partonic transport in anisotropic QCD matter, relevant to the evolution of hard probes in the aftermath of high-energy nuclear scattering events. The recently derived master equation, obtained from quantum field theory considerations, differs from Boltzmann transport by incorporating a nonlocal elastic scattering kernel arising from density gradients. After rewriting the master equation in a form suitable for numerical implementation and assuming a static density profile, we compare the nonlocal evolution to Boltzmann transport, demonstrating that the new interaction kernel is essential for accurately describing the azimuthal structure of the final-state momentum distribution. We further study the nonlocal partonic transport in the case of a matter profile governed by two-dimensional hydrodynamics, accounting for its flow and generalizing the evolution equation. Our results demonstrate the necessity of going beyond classical transport at high pt to accurately capture the structure of jets propagating through structured QCD matter. The master equation used in the numerical simulations can be seamlessly integrated into state-of-the-art transport codes.

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