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Kernel methods for evolution of generalized parton distributions

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arxiv 2412.13450 v2 pith:AP3YODEF submitted 2024-12-18 hep-ph hep-exhep-latnucl-th

classification hep-phhep-exhep-latnucl-th
keywords gpdsdistributionsevolutionmethodsmomentumcodegeneralizedparton
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Generalized parton distributions (GPDs) characterize the 3-dimensional structure of hadrons, combining information about their internal quark and gluon longitudinal momentum distributions and transverse position within the hadron. The dependence of GPDs on the factorization scale $Q^2$ allows one to connect hard exclusive processes involving GPDs at disparate energy and momentum scales, which is needed in global analyses of experimental data. In this work we explore how finite element methods can be used to construct fast and differentiable $Q^2$ evolution codes for GPDs in momentum space, which can be used in a machine learning framework. We show numerical benchmarks of the methods' accuracy, including a comparison to an existing evolution code from PARTONS/APFEL++, and provide a repository where the code can be accessed.

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  1. Toward an event-level analysis of hadron structure using differential programming

    hep-ph 2025-07 conditional novelty 4.0 of 10

    LOITS is a differentiable sampling method, demonstrated in a GAN closure test, that maps sampled events back to the parameters of a target density for event-level inference.

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