Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

12-30-2010

Journal or Book Title

Physical Review D

Volume

82

Issue

11

First Page

112008

DOI

10.1103/PhysRevD.82.112008

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.

Comments

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." Physical Review D 82, no. 11 (2010): 112008. DOI:10.1103/PhysRevD.82.112008. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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