New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei

作者：Abrahamyan, S.^*; Acha, A.; Afanasev, A.; Ahmed, Z.; Albataineh, H.; Aniol, K.; Armstrong, D. S.; Armstrong, W.; Arrington, J.; Averett, T.; Babineau, B.; Bailey, S. L.; Barber, J.; Barbieri, A.; Beck, A.; Bellini, V.; Beminiwattha, R.; Benaoum, H.; Benesch, J.; Benmokhtar, F.; Bertin, P.; Bielarski, T.; Boeglin, W.; Bosted, P.; Butaru, F.; Burtin, E.; Cahoon, J.; Camsonne, A.; Canan, M.; Carter, P.; Chang, C. C.; Cates, G. D.; Chao, Y-C; Chen, C.; Chen, J-P; Choi, Seonho

来源：Physical Review Letters, 2012, 109(19): 192501.

DOI：10.1103/PhysRevLett.109.192501

• PROTON SCATTERING

We have measured the beam-normal single-spin asymmetry An in the elastic scattering of 1-3 GeV transversely polarized electrons from H-1 and for the first time from He-4, C-12, and Pb-208. For H-1, He-4, and C-12, 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 Pb-208 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.

• 出版日期2012-11-5
• 单位中国地震局; Los Alamos; 中国科学技术大学; rutgers