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Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering

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arxiv 2006.12435 v2 pith:YY6ZSVUW submitted 2020-06-22 nucl-ex

Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering

QWeak collaboration: D. Androic , D.S. Armstrong , A. Asaturyan , K. Bartlett , J. Beaufait , R.S. Beminiwattha , J. Benesch , F. Benmokhtar
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J. Birchall R.D. Carlini J.C. Cornejo S. Covrig Dusa M.M. Dalton C.A. Davis W. Deconinck J.F. Dowd J.A. Dunne D. Dutta W.S. Duvall M. Elaasar W.R. Falk J.M. Finn T. Forest C. Gal D. Gaskell M.T.W. Gericke J. Grames V.M. Gray K. Grimm F. Guo J.R. Hoskins D. Jones M.K. Jones R.T. Jones M. Kargiantoulakis P.M. King E. Korkmaz S. Kowalski J. Leacock J.P. Leckey A.R. Lee J.H. Lee L. Lee S. MacEwan D. Mack J.A. Magee R. Mahurin J. Mammei J.W. Martin M.J. McHugh D. Meekins J. Mei K.E. Mesick R. Michaels A. Micherdzinska A. Mkrtchyan H. Mkrtchyan N. Morgan A. Narayan L.Z. Ndukum V. Nelyubin Nuruzzaman W.T.H van Oers V.F. Owen S.A. Page J. Pan K.D. Paschke S.K. Phillips M.L. Pitt R.W. Radloff J.F. Rajotte W.D. Ramsay J. Roche B. Sawatzky T. Seva M.H. Shabestari R. Silwal N. Simicevic G.R. Smith P. Solvignon D.T. Spayde A. Subedi R. Subedi R. Suleiman V. Tadevosyan W.A. Tobias V. Tvaskis B. Waidyawansa P. Wang S.P. Wells S.A. Wood S. Yang P. Zang S. Zhamkochyan
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keywords scatteringasymmetrybeam-normalmeasurementsingle-spinelasticelectron-protonexchange
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to the imaginary part of the two-photon exchange process. We report a 2% precision measurement of the beam-normal single-spin asymmetry in elastic electron-proton scattering with a mean scattering angle of theta_lab = 7.9 degrees and a mean energy of 1.149 GeV. The asymmetry result is B_n = -5.194 +- 0.067 (stat) +- 0.082 (syst) ppm. This is the most precise measurement of this quantity available to date and therefore provides a stringent test of two-photon exchange models at far-forward scattering angles (theta_lab -> 0) where they should be most reliable.

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