Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-01-28
Physics
High Energy Physics
High Energy Physics - Experiment
5 pages, 4 figures; contribution to the Proceedings of the 16th International Spin Physics Symposium, October 11-16, 2004, ICT
Scientific paper
STAR collected data in proton-proton collisions at sqrt(s)=200 GeV with transverse and longitudinal beam polarizations during the 2003 running period at RHIC. We present preliminary results on single transverse spin asymmetries A_N in the production of forward charged hadrons detected with the Beam-Beam Counters (BBC). The asymmetries A_N measured at pseudorapidities 3.9 < |eta| < 5.0 are found to be of the order of 0.01 while asymmetries measured at smaller pseudorapidities 3.4 < |eta| < 3.9 are found to be consistent with zero. The BBC and its associated scaler system for fast data recording provides the first local polarimeter at STAR. The setup has been sucessfully used to tune the spin rotator magnets and to verify longitudinal polarization at STAR.
for the STAR Collaboration
Kiryluk Joanna
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