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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

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00672492
Contributor : Dominique Girod <>
Submitted on : Tuesday, February 21, 2012 - 1:14:20 PM
Last modification on : Tuesday, January 5, 2021 - 9:30:19 AM

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A. Adare, E. T. Atomssa, D. d'Enterria, O. Drapier, F. Fleuret, et al.. Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in p+p collisions at sqrt(s)=62.4 GeV. Physical Review D, American Physical Society, 2012, 86, pp.092006. ⟨10.1103/PhysRevD.86.092006⟩. ⟨in2p3-00672492⟩

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