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

(PHENIX Collaboration)

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28 Citations (Scopus)

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.

Original languageEnglish
Article number011501
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume93
Issue number1
DOIs
Publication statusPublished - 2016 Jan 7

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fragmentation
pions
asymmetry
collisions
cross sections
partons
heavy ions
quantum chromodynamics
momentum
trends
protons
polarization
predictions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

@article{8ce4082092c64b679d5c1e574a418676,
title = "Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p+p collisions at s =510 GeV",
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.",
author = "{(PHENIX Collaboration)} and A. Adare and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and R. Akimoto and J. Alexander and M. Alfred and K. Aoki and N. Apadula and Y. Aramaki and H. Asano and Atomssa, {E. T.} and Awes, {T. C.} and B. Azmoun and V. Babintsev and M. Bai and X. Bai and Bandara, {N. S.} and B. Bannier and Barish, {K. N.} and S. Bathe and V. Baublis and C. Baumann and S. Baumgart and A. Bazilevsky and M. Beaumier and S. Beckman and R. Belmont and A. Berdnikov and Y. Berdnikov and D. Black and Blau, {D. S.} and Bok, {J. S.} and K. Boyle and Brooks, {M. L.} and J. Bryslawskyj and H. Buesching and V. Bumazhnov and S. Butsyk and S. Campbell and Chen, {C. H.} and Chi, {C. Y.} and M. Chiu and Choi, {I. J.} and Choi, {J. B.} and S. Choi and P. Christiansen and T. Chujo and Byungsik Hong and Park, {Sung Keun}",
year = "2016",
month = "1",
day = "7",
doi = "10.1103/PhysRevD.93.011501",
language = "English",
volume = "93",
journal = "Physical review D: Particles and fields",
issn = "0556-2821",
publisher = "American Institute of Physics Publising LLC",
number = "1",

}

TY - JOUR

T1 - Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p+p collisions at s =510 GeV

AU - (PHENIX Collaboration)

AU - Adare, A.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Akimoto, R.

AU - Alexander, J.

AU - Alfred, M.

AU - Aoki, K.

AU - Apadula, N.

AU - Aramaki, Y.

AU - Asano, H.

AU - Atomssa, E. T.

AU - Awes, T. C.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Bai, M.

AU - Bai, X.

AU - Bandara, N. S.

AU - Bannier, B.

AU - Barish, K. N.

AU - Bathe, S.

AU - Baublis, V.

AU - Baumann, C.

AU - Baumgart, S.

AU - Bazilevsky, A.

AU - Beaumier, M.

AU - Beckman, S.

AU - Belmont, R.

AU - Berdnikov, A.

AU - Berdnikov, Y.

AU - Black, D.

AU - Blau, D. S.

AU - Bok, J. S.

AU - Boyle, K.

AU - Brooks, M. L.

AU - Bryslawskyj, J.

AU - Buesching, H.

AU - Bumazhnov, V.

AU - Butsyk, S.

AU - Campbell, S.

AU - Chen, C. H.

AU - Chi, C. Y.

AU - Chiu, M.

AU - Choi, I. J.

AU - Choi, J. B.

AU - Choi, S.

AU - Christiansen, P.

AU - Chujo, T.

AU - Hong, Byungsik

AU - Park, Sung Keun

PY - 2016/1/7

Y1 - 2016/1/7

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevD.93.011501

DO - 10.1103/PhysRevD.93.011501

M3 - Article

VL - 93

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 1

M1 - 011501

ER -