Single spin asymmetries in l p --> h + X processes

Abstract

We study the transverse single spin asymmetry (SSA), A_N, for the single inclusive process l p (transv. polarized) --> h + X, in a perturbative QCD factorization scheme with inclusion of spin and transverse momentum dependent (TMD) distributions. By adopting the relevant TMDs (Sivers and Collins functions) as extracted from semi-inclusive deep inelastic scattering (SIDIS) and e+e- data, predictions for these SSAs are given. A measurement of A_N for this process could then provide a direct test of the validity of the TMD factorization.

5 pages, 7 ps figures, uses dis09.cls. Talk delivered by U. D'Alesio at the "XVII International Workshop on Deep-Inelastic Scattering and Related Subjects" DIS 2009, 26-30 April 2009, Madrid, Spain