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Generalized parton distributions of sea quarks in the proton from nonlocal chiral effective theory

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arxiv 2202.00266 v2 pith:WC44LPVS submitted 2022-02-01 hep-ph hep-exnucl-th

Fangcheng He , Chueng-Ryong Ji , W. Melnitchouk , A. W. Thomas , P. Wang This is my paper · ORCID
classification hep-phhep-exnucl-th
keywords gaugenonlocalquarkschiraldistributionseffectivegeneralizedgpds
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We calculate the spin-averaged generalized parton distributions (GPDs) of sea quarks in the proton at zero skewness from nonlocal covariant chiral effective theory, including one-loop contributions from intermediate states with pseudoscalar mesons and octet and decuplet baryons. A relativistic regulator is generated from the nonlocal Lagrangian where a gauge link is introduced to guarantee local gauge invariance, with additional diagrams from the expansion of the gauge link ensuring conservation of electric charge and strangeness. Flavor asymmetries for sea quarks at zero and finite momentum transfer, as well as strange form factors, are obtained from the calculated GPDs, and results compared with phenomenological extractions and lattice QCD.

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  1. Mechanical properties of the nucleon from the generalized parton distributions

    hep-ph 2025-01 conditional novelty 5.0 of 10

    Using a double-distribution GPD model constrained by elastic-scattering data, the paper fits DQ(0) = -3.37 ± 0.17 from Compton form factors and derives proton pressure, shear, and radii.

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