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Single spin asymmetries in charged kaon production from semi-inclusive deep inelastic scattering on a transversely polarized He-3 target
Zhao, Y. X. Lu, H. -J. Yan, X. Averett, Todd Bradshaw, P. C. Katich, J. Kelleher, A. Zhao, B.
Zhao, Y. X.
Lu, H. -J.
Yan, X.
Averett, Todd
Bradshaw, P. C.
Katich, J.
Kelleher, A.
Zhao, B.
Abstract
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 He-3 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 < x(bj) < 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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2014-01-01
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Physics
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https://doi.org/10.1103/PhysRevC.90.055201