Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction [superscript 3]He[superscript ↑](e,e')X
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PhysRevLett.113.022502.pdf
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Author(s)
Katich, J.
Qian, X.
Zhao, Y. X.
Allada, Kalyan C.
Aniol, K.
Annand, J. R. M.
Averett, T.
Benmokhtar, F.
Bertozzi, William
Bradshaw, P. C.
Date Issued
July 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Katich, J., X. Qian, Y. X. Zhao, K. Allada, K. Aniol, J. R. M. Annand, T. Averett, et al. “Measurement of the Target-Normal Single-Spin Asymmetry in Deep-Inelastic Scattering from the Reaction [superscript 3]He[superscript ↑](e,e')X.” Physical Review Letters 113, no. 2 (July 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction [superscript 3]He[superscript ↑](e,e')X on a polarized [superscript 3]He 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 < 2.9 GeV, 1.0 < Q[superscript 2] < 4.0 GeV[superscript 2 and 0.16 < x < 0.65. Neutron asymmetries were extracted using the effective nucleon polarization and measured proton-to-[superscript 3]He cross-section ratios. The measured neutron asymmetries are negative with an average value of (-1.09 ± 0.38) × 10[superscript -2] for invariant mass W > 2 GeV, 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.113.022502
