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Transverse beam spin asymmetries in forward-angle elastic electron-proton scattering

Abstract : We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely-polarized 3 GeV electrons from unpolarized protons at Q^2 values of 0.15 and 0.25 (GeV/c)^2 with results of A_n = -4.06 +- 0.99 (stat) +- 0.63 (syst) and A_n = -4.82 +- 1.87 (stat) +- 0.98 (syst) ppm. These results are inconsistent with calculations solely using the elastic nucleon intermediate state, and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A_n provides a direct probe of the imaginary component of the 2-gamma exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.
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http://hal.in2p3.fr/in2p3-00147801
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Soumis le : lundi 21 mai 2007 - 10:27:20
Dernière modification le : vendredi 3 avril 2020 - 11:44:46

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D.S. Armstrong, J. Arvieux, R. Asaturyan, T. Averett, S.L. Bailey, et al.. Transverse beam spin asymmetries in forward-angle elastic electron-proton scattering. Physical Review Letters, American Physical Society, 2007, 99, pp.092301. ⟨10.1103/PhysRevLett.99.092301⟩. ⟨in2p3-00147801⟩

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