11–13 Jun 2025
Europe/Rome timezone

NLO corrections and factorization for transverse single-spin asymmetries

12 Jun 2025, 09:00
35m

Speaker

Daniel Rein (Universität Tübingen)

Description

We present next-to-leading order QCD corrections for the cross sections of
$\ell p^\uparrow\to (h\,\mathrm{or}\,jet)X$ 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 $ep^\uparrow\to hX$ and
compare to data from the HERMES experiment.

Primary authors

Daniel Rein (Universität Tübingen) Marc Schlegel (University of Tuebingen) Patrick Tollkühn (Universität Tübingen) Werner Vogelsang (Univ. Tuebingen)

Presentation materials