We study the single transverse spin asymmetries in the single inclusive particle production within the framework of the generalized parton model (GPM). By carefully analyzing the initial- and final-state interactions, we include the process-dependence of the Sivers functions into the GPM formalism. The modified GPM formalism has a close connection with the collinear twist-3 approach. Within the new formalism, we make predictions for inclusive π0 and direct photon productions at RHIC energies. We find the predictions are opposite to those in the conventional GPM approach.
@article{arxiv.1009.1936,
title = {Process dependent Sivers function and implications for single spin asymmetry in inclusive hadron production},
author = {Leonard Gamberg and Zhong-Bo Kang},
journal= {arXiv preprint arXiv:1009.1936},
year = {2011}
}
Comments
12 pages, 5 figures, extended discussion on connection with twist three approach, references added