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Title: Inclusive cross section and double-helicity asymmetry for $$\pi^{0}$$ production at midrapidity in $p$$+$$p$ collisions at $$\sqrt{s}=510$$ GeV

Abstract

We present PHENIX measurements 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. Our 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. Finally, the data presented here extend to a currently unexplored region, down to x similar to 0.01, and thus provide additional constraints on the value of ΔG.

Authors:
 [1]
  1. Univ. of Colorado, Boulder, CO (United States); et al.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Org.:
PHENIX Collaboration
OSTI Identifier:
1254805
Alternate Identifier(s):
OSTI ID: 1234287; OSTI ID: 1324157
Report Number(s):
BNL-111967-2016-JA
Journal ID: ISSN 2470-0010; KB01-01-021
Grant/Contract Number:  
SC00112704; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; cross section; double-helicity; midrapidity; collisions; Relativistic Heavy Ion Collider; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 43 PARTICLE ACCELERATORS

Citation Formats

Adare, A. Inclusive cross section and double-helicity asymmetry for $\pi^{0}$ production at midrapidity in $p$$+$$p$ collisions at $\sqrt{s}=510$ GeV. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.93.011501.
Adare, A. Inclusive cross section and double-helicity asymmetry for $\pi^{0}$ production at midrapidity in $p$$+$$p$ collisions at $\sqrt{s}=510$ GeV. United States. doi:10.1103/PhysRevD.93.011501.
Adare, A. Thu . "Inclusive cross section and double-helicity asymmetry for $\pi^{0}$ production at midrapidity in $p$$+$$p$ collisions at $\sqrt{s}=510$ GeV". United States. doi:10.1103/PhysRevD.93.011501. https://www.osti.gov/servlets/purl/1254805.
@article{osti_1254805,
title = {Inclusive cross section and double-helicity asymmetry for $\pi^{0}$ production at midrapidity in $p$$+$$p$ collisions at $\sqrt{s}=510$ GeV},
author = {Adare, A.},
abstractNote = {We present PHENIX measurements 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. Our 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. Finally, the data presented here extend to a currently unexplored region, down to x similar to 0.01, and thus provide additional constraints on the value of ΔG.},
doi = {10.1103/PhysRevD.93.011501},
journal = {Physical Review D},
number = ,
volume = 93,
place = {United States},
year = {2016},
month = {1}
}

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    Iterative Monte Carlo analysis of spin-dependent parton distributions
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    Analytical approaches to the determination of spin-dependent parton distribution functions at NNLO approximation
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    • Salajegheh, Maral; Nejad, S. Mohammad Moosavi; Khanpour, Hamzeh
    • Physical Review C, Vol. 97, Issue 5
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    Longitudinal double-spin asymmetry for inclusive jet and dijet production in p p collisions at s = 510 GeV
    journal, September 2019


    Measurements of double-helicity asymmetries in inclusive J / ψ production in longitudinally polarized p + p collisions at s = 510 GeV
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    Systematic Analysis of the Non-Extensive Statistical Approach in High Energy Particle Collisions—Experiment vs. Theory
    journal, February 2017

    • Bíró, Gábor; Barnaföldi, Gergely; Biró, Tamás
    • Entropy, Vol. 19, Issue 3
    • DOI: 10.3390/e19030088