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First Extraction of Transverse Momentum Dependent Helicity Distributions

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arxiv 2409.08110 v2 pith:3EJUY26F submitted 2024-09-12 hep-ph hep-exnucl-exnucl-th

First Extraction of Transverse Momentum Dependent Helicity Distributions

classification hep-ph hep-exnucl-exnucl-th
keywords distributionsmomentumtransverseanalysisbecomedependentfirsthelicity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report on the first global analysis of transverse momentum dependent helicity distributions of the proton. The analysis is performed at next-to-leading order with the evolution factor at next-to-next-to-leading-logarithmic accuracy. Nonzero signals are determined for up and down quarks and their $k_T$-integrated polarization are consistent with analyses in collinear factorization, while the distributions of other flavors are loosely constrained by existing data. With increasing transverse momentum, quarks at large $x$ become less polarized while those at small $x$ become more polarized.

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Cited by 3 Pith papers

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