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

Physical Review D - Particles, Fields, Gravitation and Cosmology Volume 73 Issue 9 Page 091102-1-091102-5 published_at 2006-05-25
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Title ( eng )
Improved measurement of double helicity asymmetry in inclulsive midrapidity π0 production for polarized p + p collisions at √s = 200 GeV
Creator
PHENIX Collaboration
Enokizono Akitomo
Hachiya Takashi
Harada Hiroyuki
Haruna Kohta
Kohara Ryota
Nakamura Tomoaki
Tsuchimoto Yuji
Source Title
Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume 73
Issue 9
Start Page 091102-1
End Page 091102-5
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.
Keywords
helicity (elementary particles)
proton-proton inclusive interactions
polarisation in elementary particle interactions
quantum chromodynamics
perturbation theory
Language
eng
Resource Type journal article
Publisher
American Physical Society
Date of Issued 2006-05-25
Rights
Copyright (c) 2006 The American Physical Society.
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 1550-7998
[DOI] 10.1103/PhysRevD.73.091102
[NCID] AA00773624
[DOI] http://dx.doi.org/10.1103/PhysRevD.73.091102