Constraints on Gluon Sivers Distribution from RHIC Results

Details Constraints on Gluon Sivers Distribution from RHIC Results Constraints on Gluon Sivers Distribution from RHIC Results

2006-12-18

arxiv.org/abs/hep-ph/0612209v1

AIPConf.Proc.915:567-570,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX 2e, 4 pages, 2 ps figures, uses aipproc.cls. Talk delivered by U. D'Alesio at the "17th International Spin Physics Sympo

Scientific paper

10.1063/1.2750845

We consider the recent RHIC data on the transverse single spin asymmetry (SSA) A_N, measured in p(transv. polarized) p --> pion X processes at mid-rapidity by the PHENIX Collaboration. We analyze this experimental information within a hard scattering approach based on a generalized QCD factorization scheme, with unintegrated, transverse momentum dependent (TMD), parton distribution and fragmentation functions. In this kinematical region, only the gluon Sivers effect could give a large contribution to A_N; its vanishing value is thus used to give approximate upper limits on the gluon Sivers function (GSF). Additional constraints from the Burkardt sum rule for the Sivers distributions are also discussed.

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