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arXiv · 2210.12295

Accessing gluon polarization with high-$P_T$ hadrons in SIDIS

R. M. Whitehill·Yiyu Zhou·N. Sato·W. Melnitchouk
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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, $\Delta g$, along with the traditional $\Delta g > 0$ solutions. We consider polarized semi-inclusive deep-inelastic scattering for hadrons produced with large transverse momentum as a means of constraining the dependence of $\Delta g$ 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 which are particularly sensitive to the polarized gluon channel and could discriminate between the different $\Delta g$ behaviors.

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R. M. Whitehill, Yiyu Zhou, N. Sato, W. Melnitchouk. 2022-10-21. Accessing gluon polarization with high-$P_T$ hadrons in SIDIS. https://doi.org/10.1103/physrevd.107.034033

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