Nonlocal chiral contributions to generalized parton distributions of the proton at nonzero skewness

Gao, Zhengyang; He, Fangcheng; Ji, Chueng-Ryong; Melnitchouk, W.; Salamu, Y.; Wang, P.

doi:10.1103/PhysRevD.110.054049

Title: Nonlocal chiral contributions to generalized parton distributions of the proton at nonzero skewness

Journal Article · 30 September 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.110.054049 · OSTI ID:2449645

;

We compute the one-loop contributions to spin-averaged generalized parton distributions (GPDs) in the proton from pseudoscalar mesons with intermediate octet and decuplet baryon states at nonzero skewness. Our framework is based on nonlocal covariant chiral effective theory, with ultraviolet divergences regularized by introducing a relativistic regulator derived consistently from the nonlocal Lagrangian. Using the splitting functions calculated from the nonlocal Lagrangian, we find the nonzero skewness GPDs from meson loops by convoluting with the phenomenological pion GPD and the generalized distribution amplitude, and verify that these satisfy the correct polynomiality properties. We also compute the lowest two moments of GPDs to quantify the meson loop effects on the Dirac, Pauli, and gravitational form factors of the proton. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-06OR23177; FG02-03ER41260; SC0023646

OSTI ID:: 2449645

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 5 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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