We report the first measurement of target single spin asymmetries of charged kaons produced in semi-inclusive deep inelastic scattering of electrons off a transversely polarized 3He target. Both the Collins and Sivers moments, which are related to the nucleon transversity and Sivers distributions, respectively, are extracted over the kinematic range of 0.1<xbj<0.4 for K+ and K− production. While the Collins and Sivers moments for K+ are consistent with zero within the experimental uncertainties, both moments for K− favor negative values. The Sivers moments are compared to the theoretical prediction from a phenomenological fit to the world data. While the K+ Sivers moments are consistent with the prediction, the K− results differ from the prediction at the 2-sigma level.
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This work was supported in part by the U.S. National Science Foundation, and by DOE Contract No. DE-AC05-06OR23177, under which the Jefferson Science Associates (JSA) operates the Thomas Jefferson National Accelerator Facility. This work was also supported by the National Natural Science Foundation of China under Grants No. 11135002 and No. 11120101004.
Dutta, C.; Kolarkar, A.; Korsch, Wolfgang; Zhao, Y. X.; Wang, Y.; Allada, K.; Aniol, K.; Annand, J. R. M.; Averett, T.; Benmokhtar, F.; Bertozzi, W.; Bradshaw, P. C.; and Bosted, P., "Single Spin Asymmetries in Charged Kaon Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely Polarized 3He Target" (2014). Physics and Astronomy Faculty Publications. 307.