The single spin asymmetry A_N, for large P_T single inclusive particle production in p(transv. pol.) p collisions, is considered within a generalised parton model and a transverse momentum dependent factorisation scheme. The focus is on the Sivers effect and the study of its potential contribution to A_N, based on a careful analysis of the Sivers functions extracted from azimuthal asymmetries in semi-inclusive deep inelastic scattering processes. It is found that such Sivers functions could explain most features of the A_N data, including some recent STAR results which show the persistence of a non zero A_N up to surprisingly large P_T values.
@article{arxiv.1304.7691,
title = {Sivers effect and the single spin asymmetry A_N in p(transv. pol.) p --> h X processes},
author = {M. Anselmino and M. Boglione and U. D'Alesio and S. Melis and F. Murgia and A. Prokudin},
journal= {arXiv preprint arXiv:1304.7691},
year = {2013}
}
Comments
RevTex4, 15 pages, 19 eps figures, 1 Table. v2: Few comments and references added, conclusion section extended, results unchanged. Published in Phys. Rev. D