Forward Neutral-Pion Transverse Single-Spin Asymmetries in p+p Collisions at √s=200  GeV

Abelev, B. I. and Planinić, Mirko and Poljak, Nikola and Zuo, J. X. (STAR Collaboration) (2008) Forward Neutral-Pion Transverse Single-Spin Asymmetries in p+p Collisions at √s=200  GeV. Physical Review Letters, 101 (22). pp. 222001-6. ISSN 0031-9007

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Abstract

We report precision measurements of the Feynman x (xF) dependence, and first measurements of the transverse momentum (pT) dependence, of transverse single-spin asymmetries for the production of π0 mesons from polarized proton collisions at √s=200  GeV. The xF dependence of the results is in fair agreement with perturbative QCD model calculations that identify orbital motion of quarks and gluons within the proton as the origin of the spin effects. Results for the pT dependence at fixed xF are not consistent with these same perturbative QCD-based calculations.

Item Type: Article
Keywords: single spin asymmetries
Date: November 2008
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2008) 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: 10 Jun 2014 12:41
Last Modified: 10 Jun 2014 13:17
URI: http://digre.pmf.unizg.hr/id/eprint/2339

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