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Improved measurement of double helicity asymmetry in inclulsive midrapidity π0 production for polarized p+p collisions at s=200GeV

S. S. Adler et al. (PHENIX Collaboration)
Phys. Rev. D 73, 091102(R) – Published 25 May 2006

Abstract

We present an improved measurement of the double helicity asymmetry for π0 production in polarized proton-proton scattering at s=200GeV employing the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The improvements to our previous measurement come from two main factors: Inclusion of a new data set from the 2004 RHIC run with higher beam polarizations than the earlier run and a recalibration of the beam polarization measurements for the earlier run, which resulted in reduced uncertainties and increased beam polarizations. The results are compared to a Next to Leading Order (NLO) perturbative Quantum Chromodynamics (pQCD) calculation with a range of polarized gluon distributions.

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  • Received 1 February 2006

DOI:https://doi.org/10.1103/PhysRevD.73.091102

©2006 American Physical Society

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Vol. 73, Iss. 9 — 1 May 2006

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