Proton Form Factor Ratio, $μ_p G_E^p/G_M^p$ from Double Spin Asymmetry
Creators: name: Liyanage, A.
name: Armstrong, W.
name: Kang, H.
name: Maxwell, J.
name: Mulholland, J.
name: Ndukum, L.
name: Ahmidouch, A.
name: Albayrak, I.
name: Asaturyan, A.
name: Ates, O.
name: Baghdasaryan, H.
name: Boeglin, W.
name: Bosted, P.
name: Brash, E.
name: Butuceanu, C.
name: Bychkov, M.
name: Carter, P.
name: Chen, C.
name: Chen, J-P.
name: Choi, S.
name: Christy, E.
name: Covrig, S.
name: Crabb, D.
name: Danagoulian, S.
name: Daniel, A.
name: Davidenko, A. M.
name: Davis, B.
name: Day, D.
name: Deconinck, W.
name: Deur, A.
name: Dunne, J.
name: Dutta, D.
name: Fassi, L. El
name: Elaasar, M.
name: Ellis, C.
name: Ent, R.
name: Flay, D.
name: Frlez, E.
name: Gaskell, D.
name: Geagla, O.
name: German, J.
name: Gilman, R.
name: Gogami, T.
name: Gomez, J.
name: Goncharenko, Y. M.
name: Hashimoto, O.
name: Higinbotham, D.
name: Horn, T.
name: Huber, G. M.
name: Jones, M.
name: Jones, M. K.
name: Kalantarians, N.
name: Kang, H-K.
name: Kawama, D.
name: Keppel, C.
name: Khandaker, M.
name: Kim, Y.
name: King, P. M.
name: Kohl, M.
name: Kovacs, K.
name: Kubarovsky, V.
name: Li, Y.
name: Liyanage, N.
name: Mamyan, V.
name: Markowitz, P.
name: Maruta, T.
name: Melnik, Y. M.
name: Meziani, Z-E.
name: Mkrtchyan, A.
name: Mkrtchyan, H.
name: Mochalov, V. V.
name: Monaghan, P.
name: Narayan, A.
name: Nakamura, S. N.
name: Nuruzzaman
name: Pentchev, L.
name: Pocanic, D.
name: Posik, M.
name: Puckett, A.
name: Qiu, X.
name: Reinhold, J.
name: Riordan, S.
name: Roche, J.
name: Rondo'n, O. A.
name: Sawatzky, B.
name: Shabestari, M.
name: Slifer, K.
name: Smith, G.
name: Soloviev, L. F.
name: Solvignon, P.
name: Tadevosyan, V.
name: Tang, L.
name: Vasiliev, A. N.
name: Veilleux, M.
name: Walton, T.
name: Wesselmann, F.
name: Wood, S. A.
name: Yao, H.
name: Ye, Z.
name: Zhu, L.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The ratio of the electric and magnetic form factor of the proton, $μ_p G_E^p/G_M^p$, has been measured for elastic electron-proton scattering with polarized beam and target up to four-momentum transfer squared, $Q^2=5.66$ (GeV/c)$^2$ using the double spin asymmetry for target spin orientation aligned nearly perpendicular to the beam momentum direction. This measurement of $μ_p G_E^p/G_M^p$ agrees with the $Q^2$ dependence of previous recoil polarization data and reconfirms the discrepancy at high $Q^2$ between the Rosenbluth and the polarization-transfer method with a different measurement technique and systematic uncertainties uncorrelated to those of the recoil-polarization measurements. The form factor ratio at $Q^2$=2.06 (GeV/c)$^2$ has been measured as $μ_p G_E^p/G_M^p = 0.720 \pm 0.176_{stat} \pm 0.039_{sys}$, which is in agreement with an earlier measurement with the polarized target technique at similar kinematics. The form factor ratio at $Q^2$=5.66 (GeV/c)$^2$ has been determined as $μ_p G_E^p/G_M^p=0.244\pm0.353_{stat}\pm0.013_{sys}$, which represents the highest $Q^2$ reach with the double spin asymmetry with polarized target to date.