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 · 27 February 2024 · Physical Review. D.

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

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Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Old Dominion Univ., Norfolk, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); William & Mary, Williamsburg, VA (United States)
Aix Marseille Univ, Université de Toulon, CNRS, CPT, Marseille (France)

We perform a new global analysis of spin-dependent parton distribution functions with the inclusion of Ioffe time pseudo-distributions 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.

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

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

Contributing Organization:: Jefferson Lab Angular Momentum and HadStruc Collaborations

Grant/Contract Number:: SC0023047; FG02-04ER41302; SC0023646; AC02-05CH11231; AC05-00OR22725; PHY-1626177; ACI-1548562; ACI-1445606; AC05-06OR23177

OSTI ID:: 2315054

Alternate ID(s):: OSTI ID: 2318476

Report Number(s):: JLAB-THY-23-3950; DOE/OR/23177-7250; TRN: US2409542

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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