Spin Effects in Forward pi^0-production in Polarized Proton-Proton Collisions at STAR

Details Spin Effects in Forward pi^0-production in Polarized Proton-Proton Collisions at STAR Spin Effects in Forward pi^0-production in Polarized Proton-Proton Collisions at STAR

2005-05-11

arxiv.org/abs/hep-ex/0505024v1

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 2 figures, to be publised in the proceedings of the XXXXth Rencontres de Moriond on QCD and Hadronic Interactions

Scientific paper

We report some results in large pseudo rapidity pi^0-production in polarized proton collisions at 200 GeV center of mass energy. The single spin asymmetry for positive Feynman x (x_F) is consistent with zero up to ~0.35, then increases with increasing x_F. This behavior can be described by phenomenological models including the Sivers effect, Collins effect or twist-3 contributions in initial and final states. The asymmetry is found to be zero for negative x_F (-0.6pi^0+X cross sections at \eta=3.3, 3.8 and 4.0 are consistent with next-to-leading order perturbative QCD calculations.

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