Document Type

Article

Publication Date

2025

DOI

10.1103/np1g-6c2z

Publication Title

Physical Review D

Volume

112

Issue

5

Pages

054036 (1-17)

Abstract

We phenomenologically constrain the small-x and small-𝜉 gluon generalized parton distributions (GPDs) with the deeply virtual J/ψ production (DVJ/ψP) in the framework of GPDs through universal moment parameterization (GUMP). We use a hybrid cross-section formula combining collinear factorization to the next-to-leading order (NLO) accuracy of the strong coupling 𝛼s, with corrections from nonrelativistic QCD to account for the power corrections due to the heavy J/ψ mass. We reach reasonable fit to the measured differential cross sections of DVJ/ψP by H1 at the Hadron-Electron Ring Accelerator as well as forward gluon parton distribution functions (PDFs) from JAM22 global analysis. We find that both NLO and nonrelativistic corrections are significant for heavy vector meson productions. Of course, the gluon GPD we obtain still contains considerable freedom in need of inputs from other constraints, particularly in the distribution-amplitude-like region.

Rights

© 2025 The Authors.

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License. Further distribution of this work must maintain attribution to the authors and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Data Availability

The data that support the findings of this article are openly available. [109].

Original Publication Citation

Guo, Y. X., Ji, X. D., Santiago, M. G., Yang, J. H., & Zhang, H. C. (2025). Small-x gluon GPD constrained from deeply virtual J/ ψ production and gluon PDF through universal-moment parametrization. Physical Review D, 112(5), 1-17, Article 054036. https://doi.org/10.1103/np1g-6c2z

ORCID

0000-0003-0770-6279 (Santiago)

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