On the flat transverse momentum dependence of the single-spin asymmetry in inclusive neutral pion production

Abstract

We discuss recent experimental results from RHIC where the flat transverse momentum dependence of a single-spin asymmetry has been found in inclusive production of neutral pions. This dependence takes place in a wide region of the transverse momenta up to $p_T=10$ GeV/c. We emphasize that similar dependence has been predicted in the nonperturbative spin filtering mechanism for the single-spin asymmetries in hadron interactions and present some implications for this mechanism from the new experimental data.

Comments: 11 pages, 5 figures, revised and extended version: one figure and several equations have been added, textual modifications. arXiv admin note: text overlap with arXiv:0811.3862