Double Longitudinal Spin Asymmetry in Neutral Pion Production in Polarized p+p Collisions at sqrt(s)=200 GeV at PHENIX

Details Double Longitudinal Spin Asymmetry in Neutral Pion Production in Polarized p+p Collisions at sqrt(s)=200 GeV at PHENIX Double Longitudinal Spin Asymmetry in Neutral Pion Production in Polarized p+p Collisions at sqrt(s)=200 GeV at PHENIX

2007-01-26

arxiv.org/abs/hep-ex/0701048v1

AIPConf.Proc.915:335-338,2007

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 2 figures, to be published in the Proceedings of the 17th International Spin Physics Symposium (SPIN2006), Kyoto (Jap

Scientific paper

10.1063/1.2750790

A major goal of the RHIC spin program is to measure \Delta g, the gluon contribution to the proton's spin. Measurements by PHENIX of the double longitudinal spin asymmetry, A_LL, of the neutral pion production at mid-rapidity in polarized proton collisions have been shown to constrain \Delta g. Results from the 2005 RHIC run, as well as high p_T data from the 2006 RHIC run, are presented. The results disfavor maximal positive and negative values of \Delta g. A measurement of azimuthally independent double transverse spin asymmetry, A_TT, is also presented.

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