Accessing gluon polarization with high-${P}_{T}$ hadrons in SIDIS
Whitehill, R.M. Zhou, Yiyu Sato, N. Melnitchouk, W.
Whitehill, R.M.
Zhou, Yiyu
Sato, N.
Melnitchouk, W.
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2023-02-27
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Article
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Gluon,Deep inelastic scattering,Perturbative QCD
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Citation
R.M. Whitehill, Yiyu Zhou, N. Sato, and W. Melnitchouk (Jefferson Lab Angular Momentum (JAM) Collaboration)
Phys. Rev. D 107, 034033 – Published 27 February 2023
Abstract
A recent global QCD analysis of jet production and other polarized scattering data has found the
presence of negative solutions for the gluon helicity distribution in the proton, Δg, along with the traditional
Δg > 0 solutions. We consider polarized semi-inclusive deep-inelastic scattering for hadrons produced
with large transverse momentum as a means of constraining the dependence of Δg on the parton
momentum fraction, x. Focusing on the double longitudinal spin asymmetry, we identify the kinematics
relevant for future experiments at Jefferson Lab and the Electron-Ion Collider that are particularly sensitive
to the polarized gluon channel and could discriminate between the different Δg behaviors. We find that a
∼20 GeV beam at the high luminosity Jefferson Lab may be especially well-suited for discriminating
between the positive and negative solutions.
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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. Funded by SCOAP3.
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American Physical Society
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Physical Review D
Volume 107, No. 3
Volume 107, No. 3
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2470-0029