Document Type

Article

Publication Date

2024

DOI

10.1103/PhysRevD.109.036031

Publication Title

Physical Review D

Volume

109

Issue

3

Pages

036031 (1-12)

Abstract

We perform a new global analysis of spin-dependent parton distribution functions with the inclusion of Ioffe time pseudodistributions computed in lattice QCD (LQCD), which are directly sensitive to the gluon helicity distribution, Δg. These lattice data have an analogous relationship to parton distributions as do experimental cross sections, and can be readily included in global analyses. We focus in particular on the constraining capability of current LQCD data on the sign of Δg at intermediate parton momentum fractions x, which was recently brought into question by analysis of data in the absence of parton positivity constraints. We find that present LQCD data cannot discriminate between positive and negative Δg solutions, although significant changes in the solutions for both the gluon and quark sectors are observed.

Rights

© 2024 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 author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Original Publication Citation

Karpie, J., Whitehill, R. M., Melnitchouk, W., Monahan, C., Orginos, K., Qiu, J. W., Richards, D. G., Sato, N., & Zafeiropoulos, S. (2024). Gluon helicity from global analysis of experimental data and lattice QCD Ioffe time distributions. Physical Review D, 109(3), 1-12, Article 036031. https://doi.org/10.1103/PhysRevD.109.036031

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