Measurement of Transverse Single-Spin Asymmetries for Dijet Production in Proton-Proton Collisions at √s=200  GeV

Abelev, B. I. and Planinić, Mirko and Poljak, Nikola and Zuo, J. X. (STAR Collaboration) (2007) Measurement of Transverse Single-Spin Asymmetries for Dijet Production in Proton-Proton Collisions at √s=200  GeV. Physical Review Letters, 99 (14). pp. 142003-6. ISSN 0031-9007

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Abstract

We report the first measurement of the opening angle distribution between pairs of jets produced in high-energy collisions of transversely polarized protons. The measurement probes (Sivers) correlations between the transverse spin orientation of a proton and the transverse momentum directions of its partons. With both beams polarized, the wide pseudorapidity (−1≤η≤+2) coverage for jets permits separation of Sivers functions for the valence and sea regions. The resulting asymmetries are all consistent with zero and considerably smaller than Sivers effects observed in semi-inclusive deep inelastic scattering. We discuss theoretical attempts to reconcile the new results with the sizable transverse spin effects seen in semi-inclusive deep inelastic scattering and forward hadron production in pp collisions.

Item Type: Article
Keywords: p p, colliding beams polarized beam, transverse jet, pair production angular distribution, (2jet) spin, asymmetry Sivers function p, spin parton, transverse momentum correlation quark, valence quark, sea hadron, hadroproduction small-angle magnetic detector, STAR experimental results Brookhaven RHIC Coll 200 GeV-cms
Date: October 2007
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2007) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 Jul 2014 11:01
Last Modified: 01 Jul 2014 11:01
URI: http://digre.pmf.unizg.hr/id/eprint/2350

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