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

(Qweak Collaboration)

doi:10.1103/PHYSREVLETT.125.112502

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

(Qweak Collaboration)

University of Zagreb
Yerevan Physics Institute
Thomas Jefferson National Accelerator Facility
Ohio University
Louisiana Tech University
Duquesne University
University of Manitoba
University of Virginia
TRIUMF
Mississippi State University
Virginia Polytechnic Institute and State University
Southern University at New Orleans
Idaho State University
Massachusetts Institute of Technology
University of Connecticut
University of Northern British Columbia
University of Winnipeg
George Washington University

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

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.

Original language	English
Article number	112502
Journal	Physical Review Letters
Volume	125
Issue number	11
DOIs	https://doi.org/10.1103/PHYSREVLETT.125.112502
Publication status	Published - 11 Sept 2020
Externally published	Yes

Access to Document

10.1103/PHYSREVLETT.125.112502

Cite this

@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",

publisher = "American Physical Society",

number = "11",

}

TY - JOUR

T1 - Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering

AU - (Qweak Collaboration)

AU - Androić, D.

AU - Armstrong, D. S.

AU - Asaturyan, A.

AU - Bartlett, K.

AU - Beaufait, J.

AU - Beminiwattha, R. S.

AU - Benesch, J.

AU - Benmokhtar, F.

AU - Birchall, J.

AU - Carlini, R. D.

AU - Cornejo, J. C.

AU - Dusa, S. Covrig

AU - Dalton, M. M.

AU - Davis, C. A.

AU - Deconinck, W.

AU - Dowd, J. F.

AU - Dunne, J. A.

AU - Dutta, D.

AU - Duvall, W. S.

AU - Elaasar, M.

AU - Falk, W. R.

AU - Finn, J. M.

AU - Forest, T.

AU - Gal, C.

AU - Gaskell, D.

AU - Gericke, M. T.W.

AU - Grames, J.

AU - Gray, V. M.

AU - Grimm, K.

AU - Guo, F.

AU - Hoskins, J. R.

AU - Jones, D.

AU - Jones, M. K.

AU - Jones, R. T.

AU - Kargiantoulakis, M.

AU - King, P. M.

AU - Korkmaz, E.

AU - Kowalski, S.

AU - Leacock, J.

AU - Leckey, J. P.

AU - Lee, A. R.

AU - Lee, J. H.

AU - Lee, L.

AU - MacEwan, S.

AU - Mack, D.

AU - Magee, J. A.

AU - Mahurin, R.

AU - Mammei, J.

AU - Martin, J. W.

AU - McHugh, M. J.

PY - 2020/9/11

Y1 - 2020/9/11

N2 - 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.

AB - 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.

U2 - 10.1103/PHYSREVLETT.125.112502

DO - 10.1103/PHYSREVLETT.125.112502

M3 - Article

C2 - 32976004

AN - SCOPUS:85091808757

SN - 0031-9007

VL - 125

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 112502

ER -

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

Abstract

Access to Document

Fingerprint

Cite this