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Measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the reaction He 3 ↑ (e,e′)X
Katich, J Qian, X Zhao, YX Allada, K Aniol, K Annand, JRM Averett, T Benmokhtar, F Bertozzi, W Bradshaw, PC
Katich, J
Qian, X
Zhao, YX
Allada, K
Aniol, K
Annand, JRM
Averett, T
Benmokhtar, F
Bertozzi, W
Bradshaw, PC
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2014-07-11
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10.1103/PhysRevLett.113.022502
Abstract
We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction He3↑(e,e′)X on a polarized He3 gas target. Assuming time-reversal invariance, this asymmetry is strictly zero in the Born approximation but can be nonzero if two-photon-exchange contributions are included. The experiment, conducted at Jefferson Lab using a 5.89 GeV electron beam, covers a range of 1.7<W<2.9GeV, 1.0<Q2<4.0GeV2 and 0.16<x<0.65. Neutron asymmetries were extracted using the effective nucleon polarization and measured proton-to-He3 cross-section ratios. The measured neutron asymmetries are negative with an average value of (-1.09±0.38)×10-2 for invariant mass W>2GeV, which is nonzero at the 2.89σ level. Our measured asymmetry agrees both in sign and magnitude with a two-photon-exchange model prediction that uses input from the Sivers transverse momentum distribution obtained from semi-inclusive deep-inelastic scattering. © 2014 American Physical Society.
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Physical Review Letters
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