Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in $p+p$ collisions at $\sqrt{s}=62.4$ GeV - INSPIRE

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Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in $p+p$ collisions at $\sqrt{s}=62.4$ GeV

PHENIX

Collaboration

Feb, 2012

12 pages

Published in:

Phys.Rev.D 86 (2012) 092006

e-Print:

1202.4020 [hep-ex]

DOI:

10.1103/PhysRevD.86.092006

Experiments:

BNL-RHIC-PHENIX

View in:

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Abstract: (arXiv)

Unpolarized cross sections and double-helicity asymmetries of single-inclusive positive and negative charged hadrons at midrapidity from p+p collisions at sqrt(s)=62.4 GeV are presented. The PHENIX measurements 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 ~< x_gluon ~< 0.2, is consistent with recent global parameterizations disfavoring large gluon polarization.

Note:

PHENIX Collaboration. 447 authors, 12 pages, 5 figures, 5 tables. Submitted to Physical Review D

13.88.+e
13.85.-t
14.20.Dh
gluon: polarization
quantum chromodynamics: perturbation theory
higher-order: 1
higher-order: 0
strong interaction: coupling constant
helicity: asymmetry
PHENIX

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