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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, YX Wang, Y Allada, K Aniol, K Annand, JRM Averett, T Benmokhtar, F Bertozzi, W Bradshaw, PC Bosted, P
Zhao, YX
Wang, Y
Allada, K
Aniol, K
Annand, JRM
Averett, T
Benmokhtar, F
Bertozzi, W
Bradshaw, PC
Bosted, P
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Journal Article
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2014-11-03
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10.1103/PhysRevC.90.055201
Abstract
© 2014 American Physical Society. 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 He3 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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Physical Review C - Nuclear Physics
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