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Updated: Jan 22, 2026

Transverse Aortic Constriction in Mice
Published on: April 21, 2010
Next-to-Leading-Order Corrections and Factorization for Transverse Single-Spin Asymmetries
Daniel Rein1, Marc Schlegel1, Patrick Tollkühn1
1University of Tübingen, Institute for Theoretical Physics, Auf der Morgenstelle 14, D-72076 Tübingen, Germany.
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We present next-to-leading-order QCD corrections for the cross sections for ℓp^{↑}→hX and ℓp^{↑}→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^{↑}→hX and compare to data from the HERMES experiment.
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