pi0 Transverse Single-Spin Asymmetries at eta=4.1 in p+p Collisions at sqrts=200 GeV
Abstract
Large transverse single-spin asymmetries, AN, have been observed in forward hadron production at RHIC. STAR has reported precision measurements of the xF-pT dependence of AN for forward pi0 production. Contrary to expectation, the asymmetry does not fall with pT. However, questions remain about the trend at the lower end of the studied range, pT~1 GeV/c. Analysis of data from the 2008 RHIC run has extended the pi0 data in the xF > 0.4, low pT region. Preliminary results are reported.
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