Abstract
We recently measured the neutron target single spin asymmetry in the semi‐inclusive deep inelastic 3He→(e,e′π±)X reactions with a transversely polarized 3He target. The experiment was performed in Hall A at Jefferson Lab from October 2008 to February 2009 using a 40‐cm polarized 3He target. The pions were detected in the left high‐resolution spectrometer in coincidence with the scattered electrons detected by the BigBite spectrometer. The kinematic coverage focuses on the valence quark region, x = 0.13–0.41, at Q2 = 1.31–3.10(GeV/c)2. With good particle identifications using a RICH detector and an Aerogel threshold Cherenkov counter, data on the kaons were obtained at the same time. The data from this experiment, when combined with the world data, will provide constraints on the transversity and Sivers distributions on both u‐quark and d‐quark in the valence quark region.
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