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

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2010-12-30
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Adare, Andrew
Ogilvie, Craig
Dion, Alan
Hill, John
Kempel, Todd
Lajoie, John
Lebedev, Alexandre
Ogilvie, Craig
Pei, H.
Rosati, Marzia
Semenov, Alexey
Silva, C.
Vale, Carla
Wei, Feng
et al.
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Abstract

We report the first measurement of transverse single-spin asymmetries in J/psi production from transversely polarized p + p collisions at root s = 200 GeV with data taken by the PHENIX experiment in 2006 and 2008. The measurement was performed over the rapidity ranges 1.2 < vertical bar y vertical bar < 2.2 and vertical bar y vertical bar < 0.35 for transverse momenta up to 6 GeV/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 +/- 0.026(stat) +/- 0.003(syst) 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.

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<p>This article is published as Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Yasuyuki Akiba, H. Al-Bataineh, J. Alexander et al. "Measurement of transverse single-spin asymmetries for J/ψ production in polarized p+ p collisions at s= 200 GeV." <em>Physical Review D</em> 82, no. 11 (2010): 112008. DOI:<a href="http://dx.doi.org/10.1103/PhysRevD.82.112008" target="_blank">10.1103/PhysRevD.82.112008</a>. Posted with permission.</p>
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