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Measurement of transverse single-spin asymmetries for J/psi production in polarized p+p collisions at s=200GeV

Measurement of transverse single-spin asymmetries for J/psi production in polarized p+p collisions at s=200GeV,10.1103/PhysRevD.82.112008,Physical Rev

Measurement of transverse single-spin asymmetries for J/psi production in polarized p+p collisions at s=200GeV  
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A. Adare, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander, H. Al-Ta'Ani, A. Angerami, K. Aoki, N. Apadula, L. Aphecetchehttp://academic.research.microsoft.com/io.ashx?type=5&id=27607426&selfId1=0&selfId2=0&maxNumber=12&query=
We report the first measurement of transverse single-spin asymmetries in J/psi production from transversely polarized p+p collisions at s=200GeV with data taken by the PHENIX experiment in 2006 and 2008. The measurement was performed over the rapidity ranges 1.2<|y|<2.2 and |y|<0.35 for transverse momenta up to 6GeV/c. J/psi production at the Relativistic Heavy Ion Collider is dominated by processes involving initial-state gluons, and transverse single-spin asymmetries of the J/psi can provide access to gluon dynamics within the nucleon. Such asymmetries may also shed light on the long-standing question in QCD of the J/psi production mechanism. Asymmetries were obtained as a function of J/psi transverse momentum and Feynman-x, with a value of -0.086±0.026stat±0.003syst in the forward region. This result suggests possible nonzero trigluon correlation functions in transversely polarized protons and, if well defined in this reaction, a nonzero gluon Sivers distribution function.
Journal: Physical Review D - PHYS REV D , vol. 82, 2010
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