Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-05-07
AIP Conf.Proc.1149:277-280,2009
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 2 figures, contribution to the Proceedings of the 18th International Symposium on Spin Physics (SPIN 2008), Charlotte
Scientific paper
10.1063/1.3215645
The STAR experiment at RHIC measures the longitudinal double-spin asymmetry $A_{LL}$ for a variety of final states in collisions of longitudinally polarized protons to constrain the polarized gluon distribution in the proton. Asymmetries for mid-rapidity charged pion production benefit from large cross-sections and the excellent tracking and particle identification capabilities of the STAR Time Projection Chamber. This contribution presents a measurement of the ratio of cross sections for inclusive $\pi^{-}$ and $\pi^{+}$ production using data collected in 2005, as well as a new measurement of $A_{LL}$ for charged pions opposite a jet obtained from the 2006 RHIC run.
for the STAR Collaboration
Kocoloski Adam
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