Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at √s=200  GeV

Abelev, B. I. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2009) Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at √s=200  GeV. Physical Review D, 80 (11). 111108(R)-7. ISSN 1550-7998

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Abstract

We report a measurement of the longitudinal double-spin asymmetry ALL and the differential cross section for inclusive π0 production at midrapidity in polarized proton collisions at √s=200  GeV. The cross section was measured over a transverse momentum range of 1<pT<17  GeV/c and found to be in good agreement with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry was measured in the range of 3.7<pT<11  GeV/c and excludes a maximal positive gluon polarization in the proton. The mean transverse momentum fraction of π0’s in their parent jets was found to be around 0.7 for electromagnetically triggered events.

Item Type: Article
Keywords: longitudinal, spin, asymmetry
Date: December 2009
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2009) 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 09:39
Last Modified: 10 Jun 2014 09:40
URI: http://digre.pmf.unizg.hr/id/eprint/2320

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