Transverse single-spin asymmetries from p↑ + p → jet + X and p↑ + p → jet + π± + X at √s = 500 GeV at RHIC
Valparaiso University, USA
a e-mail: Jim.Drachenberg@valpo.edu
Published online: 9 June 2014
Current extractions of Sivers and transversity functions come from measurements of transverse single-spin asymmetries (SSA) from SIDIS and fragmentation functions from lepton-lepton scattering. The limited kinematic reach leaves sizable uncertainty in model predictions. One way to extend knowledge to higher kinematics is through jet production from high-energy polarized-proton collisions. The STAR detector at RHIC has observed hints of non-zero SSA's for the Collins effect from p↑ + p → jet + π± + X at 0 < η < 1 and √s = 200 GeV. Extending transverse SSA measurements for the first time to mid-rapidity jet production at 500 GeV allows one to examine the Sivers and Collins effects for a different mix of partonic subprocesses. Moreover, the increased gluon participation allows a more favorable examination of the gluon Collins-like effect. Progress toward these first measurements will be shown.
© Owned by the authors, published by EDP Sciences, 2014
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