Measurement of Sivers Asymmetries for Di-jets in {radical}(s) = 200 GeV pp Collisions at STAR
- Indiana University Cyclotron Facility, 2401 Milo B. Sampson Lane, Bloomington, IN, 47408 (United States)
Measurement of the transverse spin dependence of the di-jet opening angle in pp collisions at {radical}(s) = 200 GeV has been performed by the STAR collaboration. An analyzing power consistent with zero has been observed over a broad range in pseudorapidity sum of the two jets with respect to the polarized beam direction. A non-zero (Sivers) correlation between transverse momentum direction of partons in the initial state and transverse spin orientation of the parent proton has been previously observed in semi-inclusive deep inelastic scattering (SIDIS). The present measurements are much smaller than deduced from predictions made for STAR di-jets based on non-zero quark Sivers functions deduced from SIDIS, and furthermore indicate that gluon Sivers asymmetries are comparably small.
- OSTI ID:
- 21063980
- Journal Information:
- AIP Conference Proceedings, Vol. 915, Issue 1; Conference: 17. international spin physics symposium, Kyoto (Japan), 2-7 Oct 2006; Other Information: DOI: 10.1063/1.2750842; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA). STAR Collaboration; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ASYMMETRY
CORRELATIONS
DEEP INELASTIC SCATTERING
GEV RANGE
GLUONS
JET MODEL
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE RAPIDITY
POLARIZATION
POLARIZATION-ASYMMETRY RATIO
POLARIZED BEAMS
PROTON-PROTON INTERACTIONS
PROTONS
QUARKS
SEMI-INCLUSIVE INTERACTIONS
SPIN
SPIN ORIENTATION
TRANSVERSE MOMENTUM