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

Adare, A.

doi:10.1103/PhysRevD.93.011501

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

Journal Article · Thu Jan 07 00:00:00 EST 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.011501· OSTI ID:1254805

Adare, A. ^[1]

Univ. of Colorado, Boulder, CO (United States); et al.

We present PHENIX measurements for the cross section and double-helicity asymmetry (A_LL) 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 π⁰A_LL results follow an increasingly positive asymmetry trend with p_T 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 A_LL 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: PHENIX Collaboration

Grant/Contract Number:: SC00112704; AC05-00OR22725

OSTI ID:: 1254805

Alternate ID(s):: OSTI ID: 1234287; OSTI ID: 1324157

Report Number(s):: BNL-111967-2016-JA; KB01-01-021

Journal Information:: Physical Review D, Vol. 93; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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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

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