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

Androić, D.; Armstrong, D.  S.; Asaturyan, A.; Bartlett, K.; Beaufait, J.; Beminiwattha, R.  S.; Benesch, J.; Benmokhtar, F.; Birchall, J.; Carlini, R.  D.; Cornejo, J.  C.; Dusa, S. Covrig; Dalton, M.  M.; Davis, C.  A.; Deconinck, W.; Dowd, J.  F.; Dunne, J.  A.; Dutta, D.; Duvall, W.  S.; Elaasar, M.; Falk, W.  R.; Finn, J.  M.; Forest, T.; Gal, C.; Gaskell, D.; Gericke, M.  T. W.; Grames, J.; Gray, V.  M.; Grimm, K.; Guo, F.; Hoskins, J.  R.; Jones, D.; Jones, M.  K.; Jones, R.  T.; Kargiantoulakis, M.; King, P.  M.; Korkmaz, E.; Kowalski, S.; Leacock, J.; Leckey, J.  P.; Lee, A.  R.; Lee, J.  H.; Lee, L.; MacEwan, S.; Mack, D.; Magee, J.  A.; Mahurin, R.; Mammei, J.; Martin, J.  W.; McHugh, M.  J.; Meekins, D.; Mei, J.; Mesick, K.  E.; Michaels, R.; Micherdzinska, A.; Mkrtchyan, A.; Mkrtchyan, H.; Morgan, N.; Narayan, A.; Ndukum, L.  Z.; Nelyubin, V.; Nuruzzaman,; van Oers, W.  T. H.; Owen, V.  F.; Page, S.  A.; Pan, J.; Paschke, K.  D.; Phillips, S.  K.; Pitt, M.  L.; Radloff, R.  W.; Rajotte, J.  F.; Ramsay, W.  D.; Roche, J.; Sawatzky, B.; Seva, T.; Shabestari, M.  H.; Silwal, R.; Simicevic, N.; Smith, G.  R.; Solvignon, P.; Spayde, D.  T.; Subedi, A.; Subedi, R.; Suleiman, R.; Tadevosyan, V.; Tobias, W.  A.; Tvaskis, V.; Waidyawansa, B.; Wang, P.; Wells, S.  P.; Wood, S.  A.; Yang, S.; Zang, P.; Zhamkochyan, S.

doi:10.1103/physrevlett.125.112502

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

Journal Article · Tue Sep 08 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.112502· OSTI ID:1659672

Androić, D.;

; Asaturyan, A.; Bartlett, K.; Beaufait, J.; Beminiwattha, R. S.; Benesch, J.; Benmokhtar, F.; Birchall, J.; Carlini, R. D.; Cornejo, J. C.; Dusa, S. Covrig; Dalton, M. M.; Davis, C. A.; Deconinck, W.; Dowd, J. F.; Dunne, J. A.; Dutta, D.; Duvall, W. S.; Elaasar, M. more »

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. Here we report a 2% precision measurement of the beam-normal single-spin asymmetry in elastic electron-proton scattering with a mean scattering angle of $θ_{lab} = 7.9 °$ and a mean energy of 1.149 GeV. The asymmetry result is $B_{n} = - 5.194 \pm 0.067 (stat) \pm 0.082$ (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 ( $θ_{lab} \to 0$ ) where they should be most reliable.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Mississippi State Univ., Mississippi State, MS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF)

Contributing Organization:: Qweak Collaboration

Grant/Contract Number:: AC05-06OR23177; FG02-07ER41528

OSTI ID:: 1659672

Alternate ID(s):: OSTI ID: 1778968; OSTI ID: 1873181

Report Number(s):: JLAB-PHY-20-3202; DOE/OR/23177-4980; arXiv:2006.12435; TRN: US2203458

Journal Information:: Physical Review Letters, Vol. 125, Issue 11; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

References (29)

Measurement of the Two-Photon Exchange Contribution to the Elastic $e^{\pm} p$ Scattering Cross Sections at the VEPP-3 Storage Ring Rachek, I. A.; Arrington, J.; Dmitriev, V. F. Physical Review Letters, Vol. 114, Issue 6 https://doi.org/10.1103/PhysRevLett.114.062005	journal	February 2015
The Qweak experimental apparatus Allison, T.; Anderson, M.; Androić, D. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 781 https://doi.org/10.1016/j.nima.2015.01.023	journal	May 2015
Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering Armstrong, D. S.; Arvieux, J.; Asaturyan, R. Physical Review Letters, Vol. 99, Issue 9 https://doi.org/10.1103/PhysRevLett.99.092301	journal	August 2007
Towards a Resolution of the Proton Form Factor Problem: New Electron and Positron Scattering Data Adikaram, D.; Rimal, D.; Weinstein, L. B. Physical Review Letters, Vol. 114, Issue 6 https://doi.org/10.1103/PhysRevLett.114.062003	journal	February 2015
New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei Abrahamyan, S.; Acha, A.; Afanasev, A. Physical Review Letters, Vol. 109, Issue 19 https://doi.org/10.1103/PhysRevLett.109.192501	journal	November 2012
High Energy Elastic Scattering of Electrons on Protons Rosenbluth, M. N. Physical Review, Vol. 79, Issue 4 https://doi.org/10.1103/PhysRev.79.615	journal	August 1950
$G_{E_{p}} / G_{M_{p}}$ Ratio by Polarization Transfer in $\vec{e} p \to e \vec{p}$ Jones, M. K.; Aniol, K. A.; Baker, F. T. Physical Review Letters, Vol. 84, Issue 7 https://doi.org/10.1103/PhysRevLett.84.1398	journal	February 2000
Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering Androić, D.; Armstrong, D. S.; Arvieux, J. Physical Review Letters, Vol. 107, Issue 2 https://doi.org/10.1103/PhysRevLett.107.022501	journal	July 2011
Forward sum rule for the $2 γ$ -exchange correction to the charge-radius extraction from elastic electron scattering Gorchtein, Mikhail Physical Review C, Vol. 90, Issue 5 https://doi.org/10.1103/PhysRevC.90.052201	journal	November 2014
Radiative Corrections to Elastic and Inelastic $ep$ and $up$ Scattering Mo, L. W.; Tsai, Y. S. Reviews of Modern Physics, Vol. 41, Issue 1 https://doi.org/10.1103/RevModPhys.41.205	journal	January 1969
Beam normal spin asymmetry in elastic lepton–nucleon scattering Gorchtein, M.; Guichon, P. A. M.; Vanderhaeghen, M. Nuclear Physics A, Vol. 741 https://doi.org/10.1016/j.nuclphysa.2004.06.008	journal	September 2004
Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment Henderson, B. S.; Ice, L. D.; Khaneft, D. Physical Review Letters, Vol. 118, Issue 9 https://doi.org/10.1103/PhysRevLett.118.092501	journal	March 2017
Collinear photon exchange in the beam normal polarization asymmetry of elastic electron–proton scattering Afanasev, Andrei V.; Merenkov, N. P. Physics Letters B, Vol. 599, Issue 1-2 https://doi.org/10.1016/j.physletb.2004.08.023	journal	October 2004
Radiative corrections to electron-proton scattering Maximon, L. C.; Tjon, J. A. Physical Review C, Vol. 62, Issue 5 https://doi.org/10.1103/PhysRevC.62.054320	journal	October 2000
How to Reconcile the Rosenbluth and the Polarization Transfer Methods in the Measurement of the Proton Form Factors Guichon, P. A. M.; Vanderhaeghen, M. Physical Review Letters, Vol. 91, Issue 14 https://doi.org/10.1103/PhysRevLett.91.142303	journal	October 2003
New Measurements of the Beam Normal Spin Asymmetries at Large Backward Angles with Hydrogen and Deuterium Targets Ríos, D. Balaguer; Aulenbacher, K.; Baunack, S. Physical Review Letters, Vol. 119, Issue 1 https://doi.org/10.1103/PhysRevLett.119.012501	journal	July 2017
A high-precision polarimeter Hauger, M.; Honegger, A.; Jourdan, J. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 462, Issue 3 https://doi.org/10.1016/S0168-9002(01)00197-8	journal	April 2001
Precision measurement of the weak charge of the proton Nature, Vol. 557, Issue 7704, p. 207-211 https://doi.org/10.1038/s41586-018-0096-0	journal	May 2018
Study of Two-Photon Exchange via the Beam Transverse Single Spin Asymmetry in Electron-Proton Elastic Scattering at Forward Angles over a Wide Energy Range Gou, B.; Arvieux, J.; Aulenbacher, K. Physical Review Letters, Vol. 124, Issue 12 https://doi.org/10.1103/PhysRevLett.124.122003	journal	March 2020
Elastic scattering of electrons from polarized protons and inelastic electron scattering experiments De Rújula, A.; Kaplan, J. M.; de Rafael, E. Nuclear Physics B, Vol. 35, Issue 2 https://doi.org/10.1016/0550-3213(71)90460-3	journal	December 1971
A small proton charge radius from an electron–proton scattering experiment Xiong, W.; Gasparian, A.; Gao, H. Nature, Vol. 575, Issue 7781 https://doi.org/10.1038/s41586-019-1721-2	journal	November 2019
Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of the double virtual Compton amplitude Wells, S. P.; Averett, T.; Barkhuff, D. Physical Review C, Vol. 63, Issue 6 https://doi.org/10.1103/PhysRevC.63.064001	journal	May 2001
Beam normal spin asymmetry in the quasireal Compton scattering approximation Gorchtein, M. Physical Review C, Vol. 73, Issue 5 https://doi.org/10.1103/PhysRevC.73.055201	journal	May 2006
Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors Narayan, A.; Jones, D.; Cornejo, J. C. Physical Review X, Vol. 6, Issue 1 https://doi.org/10.1103/PhysRevX.6.011013	journal	February 2016
Two-photon exchange in elastic electron–proton scattering Afanasev, A.; Blunden, P. G.; Hasell, D. Progress in Particle and Nuclear Physics, Vol. 95 https://doi.org/10.1016/j.ppnp.2017.03.004	journal	July 2017
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 Maas, F. E.; Aulenbacher, K.; Baunack, S. Physical Review Letters, Vol. 94, Issue 8 https://doi.org/10.1103/PhysRevLett.94.082001	journal	March 2005
First Determination of the Weak Charge of the Proton Androic, D.; Armstrong, D. S.; Asaturyan, A. Physical Review Letters, Vol. 111, Issue 14 https://doi.org/10.1103/PhysRevLett.111.141803	journal	October 2013
Resonance estimates for single spin asymmetries in elastic electron-nucleon scattering Pasquini, B.; Vanderhaeghen, M. Physical Review C, Vol. 70, Issue 4 https://doi.org/10.1103/PhysRevC.70.045206	journal	October 2004
A novel comparison of Møller and Compton electron-beam polarimeters Magee, J. A.; Narayan, A.; Jones, D. Physics Letters B, Vol. 766 https://doi.org/10.1016/j.physletb.2017.01.026	journal	March 2017

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