Measurement of inclusive forward neutral pion production in 200 GeV polarized proton-proton collisions at RHIC

Measurement of inclusive forward π 0 production in the first polarized pp collision at √ s = 200 GeV was achieved using a prototype Forward (neutral) Pion Detector. The invariant differential cross section was consistent with next-to-leading order perturbative QCD calculation. Large positive analyzing power was found for large Feynman-x (xF > 0.3). In addition, a new analysis program was developed for the upgraded Forward Pion Detector (FPD).