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arXiv · 2502.13205

Non-local high-$p_t$ transport in anisotropic QCD matter

João Barata·Xiaojian Du·Andrey V. Sadofyev
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Abstract

We perform a numerical study of non-local 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 QFT considerations, differs from Boltzmann transport by incorporating a non-local 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 non-local 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 non-local 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-$p_t$ 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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João Barata, Xiaojian Du, Andrey V. Sadofyev. 2025-02-18. Non-local high-$p_t$ transport in anisotropic QCD matter. https://arxiv.org/abs/2502.13205

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