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Paper detail

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

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.

preprint2020arXivOpen access
QWeak CollaborationD. AndroicD. S. ArmstrongA. AsaturyanK. BartlettJ. BeaufaitR. S. BeminiwatthaJ. BeneschF. BenmokhtarJ. BirchallR. D. CarliniJ. C. CornejoS. Covrig DusaM. M. DaltonC. A. DavisW. DeconinckJ. F. DowdJ. A. DunneD. DuttaW. S. DuvallM. ElaasarW. R. FalkJ. M. FinnT. ForestC. GalD. GaskellM. T. W. GerickeJ. GramesV. M. GrayK. GrimmF. GuoJ. R. HoskinsD. JonesM. K. JonesR. T. JonesM. KargiantoulakisP. M. KingE. KorkmazS. KowalskiJ. LeacockJ. P. LeckeyA. R. LeeJ. H. LeeL. LeeS. MacEwanD. MackJ. A. MageeR. MahurinJ. MammeiJ. W. MartinM. J. McHughD. MeekinsJ. MeiK. E. MesickR. MichaelsA. MicherdzinskaA. MkrtchyanH. MkrtchyanN. MorganA. NarayanL. Z. NdukumV. NelyubinNuruzzamanW. T. H van OersV. F. OwenS. A. PageJ. PanK. D. PaschkeS. K. PhillipsM. L. PittR. W. RadloffJ. F. RajotteW. D. RamsayJ. RocheB. SawatzkyT. SevaM. H. ShabestariR. SilwalN. SimicevicG. R. SmithP. SolvignonD. T. SpaydeA. SubediR. SubediR. SuleimanV. TadevosyanW. A. TobiasV. TvaskisB. WaidyawansaP. WangS. P. WellsS. A. WoodS. YangP. ZangS. Zhamkochyan
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QWeak CollaborationD. AndroicD. S. ArmstrongA. AsaturyanK. BartlettJ. BeaufaitR. S. BeminiwatthaJ. BeneschF. BenmokhtarJ. BirchallR. D. CarliniJ. C. CornejoS. Covrig DusaM. M. DaltonC. A. DavisW. DeconinckJ. F. DowdJ. A. DunneD. DuttaW. S. DuvallM. ElaasarW. R. FalkJ. M. FinnT. ForestC. GalD. GaskellM. T. W. GerickeJ. GramesV. M. GrayK. GrimmF. GuoJ. R. HoskinsD. JonesM. K. JonesR. T. JonesM. KargiantoulakisP. M. KingE. KorkmazS. KowalskiJ. LeacockJ. P. LeckeyA. R. LeeJ. H. LeeL. LeeS. MacEwanD. MackJ. A. MageeR. MahurinJ. MammeiJ. W. MartinM. J. McHughD. MeekinsJ. MeiK. E. MesickR. MichaelsA. MicherdzinskaA. MkrtchyanH. MkrtchyanN. MorganA. NarayanL. Z. NdukumV. NelyubinNuruzzamanW. T. H van OersV. F. OwenS. A. PageJ. PanK. D. PaschkeS. K. PhillipsM. L. PittR. W. RadloffJ. F. RajotteW. D. RamsayJ. RocheB. SawatzkyT. SevaM. H. ShabestariR. SilwalN. SimicevicG. R. SmithP. SolvignonD. T. SpaydeA. SubediR. SubediR. SuleimanV. TadevosyanW. A. TobiasV. TvaskisB. WaidyawansaP. WangS. P. WellsS. A. WoodS. YangP. ZangS. Zhamkochyan

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