Sivers Single-Spin Asymmetry in Photon-Jet Production

Journal Article · Fri Nov 23 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.212002· OSTI ID:21024491

Bacchetta, Alessandro ^[1]; Bomhof, Cedran; Mulders, Piet J ^[2]; D'Alesio, Umberto; Murgia, Francesco ^[3]

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1. Theory Group, Deutsches Elektronen-Synchroton DESY, 22603 Hamburg (Germany)
2. Department of Physics and Astronomy, Vrije Universiteit Amsterdam, 1081 HV Amsterdam (Netherlands)
3. INFN, Sezione di Cagliari and Dipartimento di Fisica, Universita di Cagliari, 09042 Monserrato (Italy)

We study a weighted asymmetry in the azimuthal distribution of photon-jet pairs produced in the process p{sup {up_arrow}}p{yields}{gamma} jet X with a transversely polarized proton. We focus on the contribution of the Sivers effect only, considering experimental configurations accessible at the Relativistic Heavy Ion Collider. We show that predictions for the asymmetry, obtained in terms of gluonic-pole cross sections calculable in perturbative QCD, can be tested and clearly discriminated from those based on a generalized parton model, involving standard partonic cross sections. Experimental measurements of the asymmetry will therefore test our present understanding of single-spin asymmetries.

• OSTI ID: 21024491
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 99; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BROOKHAVEN RHIC
CROSS SECTIONS
PAIR PRODUCTION
PHOTONS
PROTONS
QUANTUM CHROMODYNAMICS
SPIN