Global QCD analysis of spin PDFs in the proton with high-x and lattice constraints
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Date
2025
Authors
Cocuzza, C.
Hunt-Smith, N.T.
Melnitchouk, W.
Sato, N.
Thomas, A.W.
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Physical Review D, 2025; 112(11):114017-1-114017-30
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C. Cocuzza, N. T. Hunt-Smith, W. Melnitchouk, N. Sato, and A.W. Thomas, (JAM Collaboration (Spin PDF Analysis Group))
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Abstract
We perform a comprehensive global QCD analysis of spin-dependent parton distribution functions (PDFs), combining all available data on inclusive and semi-inclusive deep-inelastic scattering (DIS), as well as inclusive weak boson and jet production in polarized pp collisions, simultaneously extracting spinaveraged PDFs and fragmentation functions. Including recent Jefferson Lab DIS data at high x, together with subleading power corrections to the leading-twist framework, allows us to verify the stability of the PDFs for W² ≥ 4 GeV² and quantify the uncertainties on the spin structure functions more reliably. We explore the use of new lattice QCD data on gluonic pseudo-Ioffe time distributions, which, together with jet production and high-x DIS data, improve the constraints on the polarized gluon PDF. The expanded kinematic reach afforded by the data into the high-x region allows us to refine the bounds on higher-twist contributions to the spin structure functions, and test the validity of the Bjorken sum rule.
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Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.