Gluon helicity from global analysis of experimental data and lattice QCD Ioffe time distributions

Karpie, J.; Whitehill, R. M.; Melnitchouk, W.; Monahan, C.; Orginos, K.; Qiu, J. -W.; Richards, D. G.; Sato, N.; Zafeiropoulos, S.

doi:10.1103/PhysRevD.109.036031

Title: Gluon helicity from global analysis of experimental data and lattice QCD Ioffe time distributions

Journal Article · 26 February 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.036031 · OSTI ID:2315054

;

; Orginos, K.;

; Richards, D. G.; Sato, N.;

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, $Δ g$ . 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 $Δ g$ 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 $Δ g$ solutions, although significant changes in the solutions for both the gluon and quark sectors are observed. Published by the American Physical Society 2024

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: Jefferson Lab Angular Momentum and HadStruc Collaborations

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; AC05-06OR23177; FG02-04ER41302; SC0023047; SC0023646

OSTI ID:: 2315054

Report Number(s):: DOE/OR/23177-7250; JLAB-THY-23-3950; 036031

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 3 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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