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ID 19502
file
creator
PHENIX Collaboration
Enokizono, Akitomo
Hachiya, Takashi
Harada, Hiroyuki
Haruna, Kohta
Kohara, Ryota
Nakamura, Tomoaki
Tsuchimoto, Yuji
subject
helicity (elementary particles)
proton-proton inclusive interactions
polarisation in elementary particle interactions
quantum chromodynamics
perturbation theory
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.
journal title
Physical Review D - Particles, Fields, Gravitation and Cosmology
volume
Volume 73
issue
Issue 9
start page
091102-1
end page
091102-5
date of issued
2006-05-25
publisher
American Physical Society
issn
1550-7998
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2006 The American Physical Society.
relation url
department
Graduate School of Science