Constraints on Gluon Sivers Distribution from RHIC Results

Journal Article · Wed Jun 13 00:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2750845· OSTI ID:21063983

Anselmino, M ^[1]; D'Alesio, U; Melis, S; Murgia, F ^[2]

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1. Dipartimento di Fisica Teorica, Universita di Torino, Via P. Giuria 1, I-10125 Torino (Italy)
2. Dipartimento di Fisica, Universita di Cagliari, C.P. 170, I-09042 Monserrato (Italy)

We consider the recent RHIC data on the transverse single spin asymmetry (SSA) AN, measured in p{up_arrow}p {yields} {pi}0X 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 AN; 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.

• OSTI ID: 21063983
• Journal Information: AIP Conference Proceedings, Vol. 915, Issue 1; Conference: 17. international spin physics symposium, Kyoto (Japan), 2-7 Oct 2006; Other Information: DOI: 10.1063/1.2750845; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BROOKHAVEN RHIC
DISTRIBUTION
FACTORIZATION
FUNCTIONS
GLUONS
INCLUSIVE INTERACTIONS
PARTICLE KINEMATICS
PARTICLE PRODUCTION
PARTICLE RAPIDITY
PIONS NEUTRAL
POLARIZED BEAMS
PROTON BEAMS
PROTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
SCATTERING
SPIN
SUM RULES
TRANSVERSE MOMENTUM