Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p+p collisions at s =510 GeV Article

Adare, A, Aidala, C, Ajitanand, NN et al. (2016). Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p+p collisions at s =510 GeV . PHYSICAL REVIEW D, 93(1), 10.1103/PhysRevD.93.011501

cited authors

  • Adare, A; Aidala, C; Ajitanand, NN; Akiba, Y; Akimoto, R; Alexander, J; Alfred, M; Aoki, K; Apadula, N; Aramaki, Y; Asano, H; Atomssa, ET; Awes, TC; Azmoun, B; Babintsev, V; Bai, M; Bai, X; Bandara, NS; Bannier, B; Barish, KN; Bathe, S; Baublis, V; Baumann, C; Baumgart, S; Bazilevsky, A; Beaumier, M; Beckman, S; Belmont, R; Berdnikov, A; Berdnikov, Y; Black, D; Blau, DS; Bok, JS; Boyle, K; Brooks, ML; Bryslawskyj, J; Buesching, H; Bumazhnov, V; Butsyk, S; Campbell, S; Chen, CH; Chi, CY; Chiu, M; Choi, IJ; Choi, JB; Choi, S; Christiansen, P; Chujo, T; Cianciolo, V; Citron, Z; Cole, BA; Cronin, N; Crossette, N; Csanád, M; Csörgo, T; Danley, TW; Datta, A; Daugherity, MS; David, G; Deblasio, K; Dehmelt, K; Denisov, A; Deshpande, A; Desmond, EJ; Ding, L; Dion, A; Diss, PB; Do, JH; D'Orazio, L; Drapier, O; Drees, A; Drees, KA; Durham, JM; Durum, A; Engelmore, T; Enokizono, A; En'Yo, H; Esumi, S; Eyser, KO; Fadem, B; Feege, N; Fields, DE; Finger, M; Fleuret, F; Fokin, SL; Frantz, JE; Franz, A; Frawley, AD; Fukao, Y; Fusayasu, T; Gainey, K; Gal, C; Gallus, P; Garg, P; Garishvili, A; Garishvili, I; Ge, H; Giordano, F; Glenn, A

authors

abstract

  • PHENIX measurements are presented for the cross section and double-helicity asymmetry (ALL) in inclusive π0 production at midrapidity from p+p collisions at s=510 GeV from data taken in 2012 and 2013 at the Relativistic Heavy Ion Collider. The next-to-leading-order perturbative-quantum-chromodynamics theory calculation is in excellent agreement with the presented cross section results. The calculation utilized parton-to-pion fragmentation functions from the recent DSS14 global analysis, which prefer a smaller gluon-to-pion fragmentation function. The π0ALL results follow an increasingly positive asymmetry trend with pT and s with respect to the predictions and are in excellent agreement with the latest global analysis results. This analysis incorporated earlier results on π0 and jet ALL and suggested a positive contribution of gluon polarization to the spin of the proton ΔG for the gluon momentum fraction range x>0.05. The data presented here extend to a currently unexplored region, down to x∼0.01, and thus provide additional constraints on the value of ΔG.

publication date

  • January 7, 2016

published in

Digital Object Identifier (DOI)

volume

  • 93

issue

  • 1