Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-05-28
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 2 figures, Invited talk given at the Recontres de Moriond 2002 on QCD and High Energy Hadronic Interactions
Scientific paper
The first run of transverse polarized protons at RHIC was recently completed which opened a new era exploring the spin structure of the proton. A first measurement of the single transverse spin asymmetry, $A_{N}$, for leading $\pi_{0}$ production from transverse colliding polarized protons at $\sqrt(s)=200 $GeV, $X_{F}>0.25$ and $p_{T}\simeq 1-4 $GeV was a focus of the STAR collaboration during the first polarized proton run at RHIC. Two new subcomponents have been added to the STAR experiment to carry out such a measurement in polarized proton collisions: a forward $\pi_{0}$ detector system at approximately $7.8 $m of the STAR interaction region to reconstruct $\pi_{0}$ mesons from their decay products $(\pi_{0}\to \gamma\gamma)$ and a beam-beam counter with large forward acceptance to provide a means of beam-related background suppression and relative luminosity measurement.
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