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The STAR collaboration has collected two large data sets for measurement of forward π0 transverse single spin asymmetries (SSA) in polarized pp collisions. Preliminary results are presented for data from two RHIC runs, from Run 11 (2011) with energy √ s=500 GeV and with luminosity of 22 pb−1 and from Run 12 (2012) with √ s=200 GeV and with luminosity of 18 pb−1. Neutral pions are measured with the STAR forward electromagnetic calorimeter with nearly full azimuthal acceptance over the range of pseudo-rapidity from 2.65 to 4.0. Large transverse SSA is now seen over a much greater range of transverse momentum, up to 10 GeV/c, than reported in previous publications. The analysis of the underlying event structure raises important questions about the overall jet-like nature of events associated with the spin asymmetry of the π0. These results may provide new insight into the 30 year old puzzle as to the nature of large SSAs in forward hadron production.

Large p_T Forward Transverse Single Spin Asymmetries of Ï^0 Mesons at âs= 200 and 500 GeV from STAR.

Large p_T Forward Transverse Single Spin Asymmetries of Ï^0 Mesons at âs= 200 and 500 GeV from STAR.