Process dependent Sivers function and implications for single spin asymmetry in inclusive hadron production

Details Process dependent Sivers function and implications for single spin asymmetry in inclusive hadron production Process dependent Sivers function and implications for single spin asymmetry in inclusive hadron production

2010-09-10

arxiv.org/abs/1009.1936v2

Phys.Lett.B696:109-118,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 5 figures, extended discussion on connection with twist three approach, references added

Scientific paper

10.1016/j.physletb.2010.11.066

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 $\pi^0$ and direct photon productions at RHIC energies. We find the predictions are opposite to those in the conventional GPM approach.

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