Inclusive cross section and double-helicity asymmetry for $π^{0}$ production at midrapidity in $p$$+$$p$ collisions at $\sqrt{s}=510$ GeV
Creators: name: Adare, A.
name: Aidala, C.
name: Ajitanand, N. N.
name: Akiba, Y.
name: Akimoto, R.
name: Alexander, J.
name: Alfred, M.
name: Aoki, K.
name: Apadula, N.
name: Aramaki, Y.
name: Asano, H.
name: Atomssa, E. T.
name: Awes, T. C.
name: Azmoun, B.
name: Babintsev, V.
name: Bai, M.
name: Bai, X.
name: Bandara, N. S.
name: Bannier, B.
name: Barish, K. N.
name: Bathe, S.
name: Baublis, V.
name: Baumann, C.
name: Baumgart, S.
name: Bazilevsky, A.
name: Beaumier, M.
name: Beckman, S.
name: Belmont, R.
name: Berdnikov, A.
name: Berdnikov, Y.
name: Black, D.
name: Blau, D. S.
name: Bok, J. S.
name: Boyle, K.
name: Brooks, M. L.
name: Bryslawskyj, J.
name: Buesching, H.
name: Bumazhnov, V.
name: Butsyk, S.
name: Campbell, S.
name: Chen, C. -H.
name: Chi, C. Y.
name: Chiu, M.
name: Choi, I. J.
name: Choi, J. B.
name: Choi, S.
name: Christiansen, P.
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name: Cianciolo, V.
name: Citron, Z.
name: Cole, B. A.
name: Cronin, N.
name: Crossette, N.
name: Csanád, M.
name: Csörgő, T.
name: Danley, D.
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name: Daugherity, M. S.
name: David, G.
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name: Dehmelt, K.
name: Denisov, A.
name: Deshpande, A.
name: Desmond, E. J.
name: Ding, L.
name: Dion, A.
name: Diss, P. B.
name: Do, J. H.
name: D'Orazio, L.
name: Drapier, O.
name: Drees, A.
name: Drees, K. A.
name: Durham, J. M.
name: Durum, A.
name: Engelmore, T.
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name: Esumi, S.
name: Eyser, K. O.
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name: Fields, D. E.
name: Finger, M.
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name: Fokin, S. L.
name: Frantz, J. E.
name: Franz, A.
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name: Fusayasu, T.
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name: de Cassagnac, R. Granier
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name: Haseler, T. O. S.
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name: Hemmick, T. K.
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name: Hong, B.
name: Hoshino, T.
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name: Ichihara, T.
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name: Kim, D. J.
name: Kim, E. -J.
name: Kim, G. W.
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name: Kim, Y. -J.
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name: Kimelman, B.
name: Kistenev, E.
name: Kitamura, R.
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name: Lai, Y. S.
name: Lajoie, J. G.
name: Lebedev, A.
name: Lee, D. M.
name: Lee, G. H.
name: Lee, J.
name: Lee, K. B.
name: Lee, K. S.
name: Lee, S
name: Lee, S. H.
name: Leitch, M. J.
name: Leitgab, M.
name: Lewis, B.
name: Li, X.
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name: Liu, M. X.
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name: Woody, C. L.
name: Wysocki, M.
name: Xia, B.
name: Xue, L.
name: Yalcin, S.
name: Yamaguchi, Y. L.
name: Yanovich, A.
name: Yokkaichi, S.
name: Yoo, J. H.
name: Yoon, I.
name: You, Z.
name: Younus, I.
name: Yu, H.
name: Yushmanov, I. E.
name: Zajc, W. A.
name: Zelenski, A.
name: Zhou, S.
name: Zou, L.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: PHENIX measurements are presented for the cross section and double-helicity asymmetry ($A_{LL}$) in inclusive $π^0$ production at midrapidity from $p$$+$$p$ collisions at $\sqrt{s}=510$~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 $π^{0}A_{LL}$ results follow an increasingly positive asymmetry trend with $p_T$ and $\sqrt{s}$ with respect to the predictions and are in excellent agreement with the latest global analysis results. This analysis incorporated earlier results on $π^0$ and jet $A_{LL}$, and suggested a positive contribution of gluon polarization to the spin of the proton $ΔG$ for the gluon momentum fraction range $x&gt;0.05$. The data presented here extend to a currently unexplored region, down to $x\sim0.01$, and thus provide additional constraints on the value of $ΔG$. The results confirm the evidence for nonzero $ΔG$ using a different production channel in a complementary kinematic region.
description: 413 authors, 8 pages, 4 figures. v2 is version accepted as PRD Rapid Communication. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html