Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

11-8-2012

Journal or Book Title

Physical Review D

Volume

86

Issue

9

First Page

092006

DOI

10.1103/PhysRevD.86.092006

Abstract

Unpolarized cross sections and double-helicity asymmetries of single-inclusive positive and negative charged hadrons at midrapidity from p + p collisions at root s = 62.4 GeV are presented. The PHENIX measurement of the cross sections for 1.0 < p(T) < 4.5 GeV/c are consistent with perturbative QCD calculations at next-to-leading order in the strong-coupling constant, alpha(s). Resummed pQCD calculations including terms with next-to-leading-log accuracy, yielding reduced theoretical uncertainties, also agree with the data. The double-helicity asymmetry, sensitive at leading order to the gluon polarization in a momentum-fraction range of 0.05 less than or similar to x(gluon) less than or similar to 0.2, is consistent with recent global parametrizations disfavoring large gluon polarization.

Comments

This is an article from Physical Review D 86 (2012): 092006-1, doi:10.1103/PhysRevD.86.092006. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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