Sivers Effect Asymmetries in Hadronic Collisions

Journal Article · Wed Jun 13 04:00:00 EDT 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2750844· OSTI ID:21063982

Bomhof, C J; Mulders, P J ^[1]

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1. Department of Physics and Astronomy, Vrije Universiteit Amsterdam, NL-1081 HV Amsterdam (Netherlands)

We argue that weighted azimuthal single spin asymmetries in back-to-back jet or pion production in polarized proton-proton scattering can be written as convolutions of universal distribution and fragmentation functions with gluonic pole cross sections as hard functions. Gluonic pole cross sections are gauge-invariant weighted sums of Feynman diagrams. The weight factors are a direct consequence of the (diagram-dependence of) gauge links. The best known consequence of the gauge links is the generation of the Sivers effect that is a source for single-spin asymmetries. Moreover, due to the dependence of the gauge links on the color-flow of the hard diagram the Sivers effect in SIDIS enters with opposite sign as it does in Drell-Yan scattering. The weight factors in the gluonic pole cross sections are the appropriate generalizations to more complicated processes of this relative sign difference. Furthermore, it is argued that the gluon-Sivers effect appears in twofold.

• OSTI ID: 21063982
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 915; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
COLOR MODEL
CROSS SECTIONS
DISTRIBUTION
DRELL MODEL
FEYNMAN DIAGRAM
FUNCTIONS
GAUGE INVARIANCE
GLUONS
HADRONS
INCLUSIVE INTERACTIONS
JET MODEL
PARTICLE PRODUCTION
POLARIZATION
POLARIZED BEAMS
PROTON-PROTON INTERACTIONS
SCATTERING
SPIN