Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p+p collisions at √s = 510 GeV
PHENIX Collaboration. (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), Article 011501. https://doi.org/10.1103/PhysRevD.93.011501
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2016Copyright
© 2016 American Physical Society. Published in this repository with the kind permission of the publisher.
PHENIX measurements are presented for the cross section and double-helicity asymmetry (ALL) in
inclusive π0 production at midrapidity from p þ p collisions at ffiffi
s p ¼ 510 GeV from data taken in 2012
and 2013 at the Relativistic Heavy Ion Collider. The next-to-leading-order perturbative-quantumchromodynamics
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 ffiffi
s p 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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