New Data-Driven Constraints on the Sign of Gluon Polarization in the Proton

Recently, the possible existence of negative gluon helicity Δg has been observed to be compatible with existing empirical constraints, including from jet production in polarized proton-proton collisions at the Relativistic Heavy Ion Collider, and lattice QCD data on polarized gluon Ioffe time distri...

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Bibliographic Details
Published in:Physical review letters 2024-10, Vol.133 (16), p.161901, Article 161901
Main Authors: Hunt-Smith, N T, Cocuzza, C, Melnitchouk, W, Sato, N, Thomas, A W, White, M J
Format: Article
Language:English
Subjects:
lattice field theory
lattice gauge theory
lattice QCD
nucleon spin structure
parton distribution functions
QCD phenomenology
quantum chromodynamics
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Summary:Recently, the possible existence of negative gluon helicity Δg has been observed to be compatible with existing empirical constraints, including from jet production in polarized proton-proton collisions at the Relativistic Heavy Ion Collider, and lattice QCD data on polarized gluon Ioffe time distributions. We perform a new global analysis of polarized parton distributions in the proton with new constraints from the high-x region of deep-inelastic scattering (DIS). A dramatic reduction in the quality of the fit for the negative Δg replicas compared to those with positive Δg suggests that the negative Δg solution cannot simultaneously account for high-x polarized DIS data along with lattice and polarized jet data.
ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/PhysRevLett.133.161901