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)