NLO corrections and factorization for transverse single-spin asymmetries

2025/03/20 by Rein, Daniel, Schlegel, Marc, Tollkühn, Patrick +1 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2503.16097

Abstract

We present next-to-leading order QCD corrections for the cross sections for ℓ p^\uparrow→ hX, ℓ p^\uparrow→ jetX with transversely polarized initial protons. These cross sections are known to be power-suppressed in QCD and probe twist-3 parton correlation functions in the proton. Our calculation exhibits the full complexity of a perturbative QCD analysis beyond leading power, involving in particular various derivatives of the parton correlation functions. We demonstrate that collinear factorization for these single-spin observables holds at one loop. We also present exploratory phenomenological results for the NLO single-spin asymmetry in ep^\uparrow→ hX and compare to data from the HERMES experiment.

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