Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-12-14
AIPConf.Proc.915:555-558,2007
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 3 figures, talk presented at SPIN 2006, Kyoto, October 2006
Scientific paper
10.1063/1.2750842
Measurement of the transverse spin dependence of the di-jet opening angle in pp collisions at sqrt{s}=200 GeV has been performed by the STAR collaboration. An analyzing power consistent with zero has been observed over a broad range in pseudorapidity sum of the two jets with respect to the polarized beam direction. A non-zero (Sivers) correlation between transverse momentum direction of partons in the initial state and transverse spin orientation of the parent proton has been previously observed in semi-inclusive deep inelastic scattering (SIDIS). The present measurements are much smaller than deduced from predictions made for STAR di-jets based on non-zero quark Sivers functions deduced from SIDIS, and furthermore indicate that gluon Sivers asymmetries are comparably small.
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