arXiv:1304.7691·v2·High Energy Physics — Phenomenology
Sivers effect and the single spin asymmetry A_N in p(transv. pol.) p --> h X processes
M. Anselmino (1,2)🇮🇹 · M. Boglione (1,2)🇮🇹 · U. D'Alesio (3,4)🇮🇹 · S. Melis (1,2)🇮🇹 · F. Murgia (4)🇮🇹 · A. Prokudin (5) ((1) University of Torino, Italy, (2) INFN, Torino, Italy, (3) University of Cagliari, Italy, (4) INFN, Cagliari, Italy, (5) JLab, Newport News, USA)🇺🇸
Abstract
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.
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