Parametrization of Generalized Parton Distributions from 𝑡-Channel String Exchange in AdS Spaces

Mamo, Kiminad A.; Zahed, Ismail

doi:10.1103/PhysRevLett.133.241901

Title: Parametrization of Generalized Parton Distributions from 𝑡-Channel String Exchange in AdS Spaces

Journal Article · 09 December 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.133.241901 · OSTI ID:2480750

^[1]; Zahed, Ismail ^[2]

College of William and Mary, Williamsburg, VA (United States)
Stony Brook Univ., NY (United States)

We introduce a string-based parametrization for nucleon quark and gluon generalized parton distributions (GPDs) that is valid for all skewness. Our approach leverages conformal moments, representing them as the sum of spin-𝑗 nucleon 𝐴-form factor and skewness-dependent spin-𝑗 nucleon 𝐷-form factor, derived from 𝑡-channel string exchange in AdS spaces consistent with Lorentz invariance and unitarity. This model-independent framework, satisfying the polynomiality condition due to Lorentz invariance, uses Mellin moments from empirical data to estimate these form factors. With just five Regge slope parameters, our method accurately produces various nucleon quark GPD types and symmetric nucleon gluon GPDs through pertinent Mellin-Barnes integrals. Our isovector nucleon quark GPD is in agreement with existing lattice data, promising to improve the empirical extraction and global analysis of nucleon GPDs in exclusive processes, by avoiding the deconvolution problem at any skewness, for the first time.

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Research Organization:: Temple Univ., Philadelphia, PA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER41302; SC0023646

OSTI ID:: 2480750

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 133; ISSN 1079-7114; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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