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Physical Review D 86 (2012) 092006
Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in p+p collisions at sqrt(s)=62.4 GeV
A. Adare, E.T. Atomssa1, D. d'Enterria1, O. Drapier1, F. Fleuret1, M. Gonin1, R. Granier de Cassagnac1, A. Rakotozafindrabe1, V.-N. Tram1, L. Aphecetche2, A. Hadj Henni2
STAR Collaboration(s)

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.
1 :  LLR - Laboratoire Leprince-Ringuet
2 :  SUBATECH - Laboratoire SUBATECH Nantes
Physique/Physique des Hautes Energies - Expérience

Physique/Physique Nucléaire Expérimentale
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