Spin Effects in Large Rapidity Neutral Pion Production at Star

First measurements of large Feynman x (x_F) neutral pion production in polarized proton collisions at √ s = 200 {GeV} were reported previously. Cross section measurements at < η > = 3.3 and 3.8 and analyzing power (A_N) measurements at < η > = 3.8 were completed for 0.3 < x_F< 0.6. The cross section was found to be consistent with next-to-leading order perturbative QCD calculations. In that framework, the dominant subprocess is partonic collisions of valence quarks on low Bjorken-x gluons. The A_N was found to be large, positive, increasing with x_F, and consistent with phenomonological calculations based on the Collins effect, the Sivers effect, and initial- and final-state higher twist contributions. Subsequent data have been acquired with transverse polarized proton collisions at RHIC at √ s = 200 {GeV}. The status of the analysis and preliminary results will be presented.