Cross sections and double-helicity asymmetries of midrapidity inclusive   charged hadrons in p+p collisions at sqrt(s)=62.4 GeV
  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. 
A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, H.   Al-Bataineh, J. Alexander, K. Aoki, L. Aphecetche, J. Asai...
hep-ex nucl-ex