arXiv · 1806.11156
Proton Form Factor Ratio, $μ_p G_E^p/G_M^p$ from Double Spin Asymmetry
Abstract
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.
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A. Liyanage, W. Armstrong, H. Kang, J. Maxwell, J. Mulholland, L. Ndukum, A. Ahmidouch, I. Albayrak, A. Asaturyan, O. Ates, H. Baghdasaryan, W. Boeglin, P. Bosted, E. Brash, C. Butuceanu, M. Bychkov, P. Carter, C. Chen, J-P. Chen, S. Choi, E. Christy, S. Covrig, D. Crabb, S. Danagoulian, A. Daniel, A. M. Davidenko, B. Davis, D. Day, W. Deconinck, A. Deur, J. Dunne, D. Dutta, L. El Fassi, M. Elaasar, C. Ellis, R. Ent, D. Flay, E. Frlez, D. Gaskell, O. Geagla, J. German, R. Gilman, T. Gogami, J. Gomez, Y. M. Goncharenko, O. Hashimoto, D. Higinbotham, T. Horn, G. M. Huber, M. Jones, M. K. Jones, N. Kalantarians, H-K. Kang, D. Kawama, C. Keppel, M. Khandaker, Y. Kim, P. M. King, M. Kohl, K. Kovacs, V. Kubarovsky, Y. Li, N. Liyanage, V. Mamyan, P. Markowitz, T. Maruta, Y. M. Melnik, Z-E. Meziani, A. Mkrtchyan, H. Mkrtchyan, V. V. Mochalov, P. Monaghan, A. Narayan, S. N. Nakamura, Nuruzzaman, L. Pentchev, D. Pocanic, M. Posik, A. Puckett, X. Qiu, J. Reinhold, S. Riordan, J. Roche, O. A. Rondo'n, B. Sawatzky, M. Shabestari, K. Slifer, G. Smith, L. F. Soloviev, P. Solvignon, V. Tadevosyan, L. Tang, A. N. Vasiliev, M. Veilleux, T. Walton, F. Wesselmann, S. A. Wood, H. Yao, Z. Ye, L. Zhu. 2018-08-06. Proton Form Factor Ratio, $μ_p G_E^p/G_M^p$ from Double Spin Asymmetry. https://doi.org/10.1103/physrevc.101.035206
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