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Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering.
Androic, 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.
Affiliation
  • Androic D; University of Zagreb, Zagreb, HR 10002, Croatia.
  • Armstrong DS; William & Mary, Williamsburg, Virginia 23185, USA.
  • Asaturyan A; A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), Yerevan 0036, Armenia.
  • Bartlett K; William & Mary, Williamsburg, Virginia 23185, USA.
  • Beaufait J; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Beminiwattha RS; Ohio University, Athens, Ohio 45701, USA.
  • Benesch J; Louisiana Tech University, Ruston, Louisiana 71272, USA.
  • Benmokhtar F; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Birchall J; Duquesne University, Pittburgh, Pennsylvania 15282, USA.
  • Carlini RD; University of Manitoba, Winnipeg, Manitoba R3T2N2, Canada.
  • Cornejo JC; William & Mary, Williamsburg, Virginia 23185, USA.
  • Dusa SC; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Dalton MM; William & Mary, Williamsburg, Virginia 23185, USA.
  • Davis CA; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Deconinck W; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Dowd JF; University of Virginia, Charlottesville, Virginia 22903, USA.
  • Dunne JA; TRIUMF, Vancouver, British Columbia V6T2A3, Canada.
  • Dutta D; William & Mary, Williamsburg, Virginia 23185, USA.
  • Duvall WS; William & Mary, Williamsburg, Virginia 23185, USA.
  • Elaasar M; Mississippi State University, Mississippi State, Mississippi 39762, USA.
  • Falk WR; Mississippi State University, Mississippi State, Mississippi 39762, USA.
  • Finn JM; Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061, USA.
  • Forest T; Southern University at New Orleans, New Orleans, Louisiana 70126, USA.
  • Gal C; University of Manitoba, Winnipeg, Manitoba R3T2N2, Canada.
  • Gaskell D; William & Mary, Williamsburg, Virginia 23185, USA.
  • Gericke MTW; Louisiana Tech University, Ruston, Louisiana 71272, USA.
  • Grames J; Idaho State University, Pocatello, Idaho 83209, USA.
  • Gray VM; University of Virginia, Charlottesville, Virginia 22903, USA.
  • Grimm K; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Guo F; University of Manitoba, Winnipeg, Manitoba R3T2N2, Canada.
  • Hoskins JR; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Jones D; William & Mary, Williamsburg, Virginia 23185, USA.
  • Jones MK; William & Mary, Williamsburg, Virginia 23185, USA.
  • Jones RT; Louisiana Tech University, Ruston, Louisiana 71272, USA.
  • Kargiantoulakis M; Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • King PM; William & Mary, Williamsburg, Virginia 23185, USA.
  • Korkmaz E; University of Virginia, Charlottesville, Virginia 22903, USA.
  • Kowalski S; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  • Leacock J; University of Connecticut, Storrs-Mansfield, Connecticut 06269, USA.
  • Leckey JP; University of Virginia, Charlottesville, Virginia 22903, USA.
  • Lee AR; Ohio University, Athens, Ohio 45701, USA.
  • Lee JH; University of Northern British Columbia, Prince George, British Columbia V2N4Z9, Canada.
  • Lee L; Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • MacEwan S; Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061, USA.
  • Mack D; William & Mary, Williamsburg, Virginia 23185, USA.
  • Magee JA; Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061, USA.
  • Mahurin R; William & Mary, Williamsburg, Virginia 23185, USA.
  • Mammei J; Ohio University, Athens, Ohio 45701, USA.
  • Martin JW; University of Manitoba, Winnipeg, Manitoba R3T2N2, Canada.
  • McHugh MJ; TRIUMF, Vancouver, British Columbia V6T2A3, Canada.
Phys Rev Lett ; 125(11): 112502, 2020 Sep 11.
Article in En | MEDLINE | ID: mdl-32976004
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 θ_{lab}=7.9° 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 (θ_{lab}→0) where they should be most reliable.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2020 Document type: Article Affiliation country: Croacia
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Add to My VHL
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2020 Document type: Article Affiliation country: Croacia