@article{c2d1535d1ab54484a072403ffe612913,
title = "Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering",
abstract = "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 θlab=7.9° and a mean energy of 1.149 GeV. The asymmetry result is Bn=-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 (θlab→0) where they should be most reliable.",
author = "\{(Qweak Collaboration)\} and D. Androi{\'c} and Armstrong, \{D. S.\} and A. Asaturyan and K. Bartlett and J. Beaufait and Beminiwattha, \{R. S.\} and J. Benesch and F. Benmokhtar and J. Birchall and Carlini, \{R. D.\} and Cornejo, \{J. C.\} and Dusa, \{S. Covrig\} and Dalton, \{M. M.\} and Davis, \{C. A.\} and W. Deconinck and Dowd, \{J. F.\} and Dunne, \{J. A.\} and D. Dutta and Duvall, \{W. S.\} and M. Elaasar and Falk, \{W. R.\} and Finn, \{J. M.\} and T. Forest and C. Gal and D. Gaskell and Gericke, \{M. T.W.\} and J. Grames and Gray, \{V. M.\} and K. Grimm and F. Guo and Hoskins, \{J. R.\} and D. Jones and Jones, \{M. K.\} and Jones, \{R. T.\} and M. Kargiantoulakis and King, \{P. M.\} and E. Korkmaz and S. Kowalski and J. Leacock and Leckey, \{J. P.\} and Lee, \{A. R.\} and Lee, \{J. H.\} and L. Lee and S. MacEwan and D. Mack and Magee, \{J. A.\} and R. Mahurin and J. Mammei and Martin, \{J. W.\} and McHugh, \{M. J.\}",
note = "Publisher Copyright: {\textcopyright} 2020 American Physical Society.",
year = "2020",
month = sep,
day = "11",
doi = "10.1103/PHYSREVLETT.125.112502",
language = "English",
volume = "125",
journal = "Physical Review Letters",
issn = "0031-9007",
number = "11",
}