title: Indication on the process dependence of the Sivers effect.
abstract: We analyze the spin asymmetry for single inclusive jet production in proton-proton collisions collected by the AnDY experiment at the Relativistic Heavy Ion Collider and the Sivers asymmetry data from semi-inclusive deep inelastic scattering experiments. In particular, we consider the role color gauge invariance plays in determining the process dependence of the Sivers effect. We find that after carefully taking into account the initial-state and final-state interactions between the active parton and the remnant of the polarized hadron, the calculated jet spin asymmetry based on the Sivers functions extracted from HERMES and COMPASS experiments is consistent with the AnDY experimental data. This provides a first indication for the process dependence of the Sivers effect in these processes. We also make predictions for both direct photon and Drell-Yan spin asymmetry, to further test the process dependence of the Sivers effect in future experiments.
authors.affiliation: Division of Science, Penn State University Berks, Reading, Pennsylvania 19610, USA.
authors.forename: Leonard
authors.initials: L
authors.lastname: Gamberg
authors.affiliation: Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Zhong-Bo
authors.initials: ZB
authors.lastname: Kang
authors.affiliation: Theory Center, Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA.
authors.forename: Alexei
authors.initials: A
authors.lastname: Prokudin