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26 April 2024

» pubmed » pmid15783877

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Measurement of the transverse beam spin asymmetry in elastic electron-proton scattering and the inelastic contribution to the imaginary part of the two-photon exchange amplitude
F E Maas ; K Aulenbacher ; S Baunack ; L Capozza ; J Diefenbach ; B Gläser ; Y Imai ; T Hammel ; D von Harrach ; E-M Kabuss ; R Kothe ; J H Lee ; A Sanchez-Lorente ; E Schilling ; D Schwaab ; G Stephan ; G Weber ; C Weinrich ; I Altarev ; J Arvieux ; M Elyakoubi ; R Frascaria ; R Kunne ; M Morlet ; S Ong ; J Vandewiele ; S Kowalski ; R Suleiman ; S Taylor ;
Date:	4 Mar 2005
Journal:	Phys Rev Lett, 94 (8), 082001
Abstract:	We report on a measurement of the asymmetry in the scattering of transversely polarized electrons off unpolarized protons, A( perpendicular), at two Q2 values of 0.106 and 0.230 (GeV/c)(2) and a scattering angle of 30 degrees <theta(e)<40 degrees . The measured transverse asymmetries are A( perpendicular)(Q(2)=0.106 (GeV/c)(2))=(-8.59+/-0.89(stat)+/-0.75(syst))x10(-6) and A( perpendicular)(Q(2)=0.230 (GeV/c)(2))=(-8.52+/-2.31(stat)+/-0.87(syst))x10(-6). The first errors denote the statistical error and the second the systematic uncertainties. From comparison with theoretical estimates of A( perpendicular) we conclude that piN-intermediate states give a substantial contribution to the imaginary part of the two-photon amplitude. There is no obvious reason why this should be different for the real part of the two-photon amplitude, which enters into the radiative corrections for the Rosenbluth separation measurements of the electric form factor of the proton.
Source:	PubMed, pmid15783877
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