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

Abstract : We have measured the beam-normal single-spin asymmetry $A_n$ in the elastic scattering of 1-3 GeV transversely polarized electrons from $^1$H and for the first time from $^4$He, $^{12}$C, and $^{208}$Pb. For $^1$H, $^4$He and $^{12}$C, 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 $^{208}$Pb 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.
Document type :
Journal articles

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Submitted on : Thursday, October 25, 2012 - 8:50:30 AM
Last modification on : Monday, December 13, 2021 - 9:14:56 AM

### Citation

S. Abrahamyan, A. Acha, A. Afanasev, Z. Ahmed, H. Albataineh, et al.. New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei. Physical Review Letters, American Physical Society, 2012, 109, pp.192501. ⟨10.1103/PhysRevLett.109.192501⟩. ⟨in2p3-00745218⟩

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