Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-10-29
Phys.Rev.Lett.92:171801,2004
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, 3 figures. v2 with minor formatting and text changes as requested by Phys. Rev. Lett. Plain text table of data in the
Scientific paper
10.1103/PhysRevLett.92.171801
Measurements of the production of forward high-energy pi0 mesons from transversely polarized proton collisions at \sqrt{s}=200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at x_F below about 0.3, and becomes positive and large at higher x_F, similar to the trend in data at \sqrt{s}<=20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with p_T>1 GeV/c at a polarized proton collider.
Adams Jeffrey
STAR Collaboration
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