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New measurements of the transverse beam asymmetry for elastic electron scattering from selected nuclei
Abrahamyan, S Acha, A Afanasev, A Ahmed, Z Albataineh, H Aniol, K Armstrong, DS Armstrong, W Arrington, J Averett, T
Abrahamyan, S
Acha, A
Afanasev, A
Ahmed, Z
Albataineh, H
Aniol, K
Armstrong, DS
Armstrong, W
Arrington, J
Averett, T
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Journal Article
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2012-11-05
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10.1103/PhysRevLett.109.192501
Abstract
We have measured the beam-normal single-spin asymmetry A n in the elastic scattering of 1-3 GeV transversely polarized electrons from H1 and for the first time from He4, C12, and Pb208. For H1, He4, and C12, the measurements are in agreement with calculations that relate A n to the imaginary part of the two-photon exchange amplitude including inelastic intermediate states. Surprisingly, the Pb208 result is significantly smaller than the corresponding prediction using the same formalism. These results suggest that a systematic set of new A n measurements might emerge as a new and sensitive probe of the structure of heavy nuclei. © 2012 American Physical Society.
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Physical Review Letters
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