Proton form factor ratio μpGEp/GMp from double spin asymmetry
| Autor: | Ho. Kang, J. Roche, X. Qiu, Z. Ye, H. Kang, H. Mkrtchyan, S. A. Wood, M. Veilleux, C. Butuceanu, Tomofumi Maruta, Osamu Hashimoto, Nilanga Liyanage, E. J. Brash, A. Mkrtchyan, Amrendra Narayan, T. Walton, H. Baghdasaryan, Andrey Vasiliev, P. M. King, V. P. Kubarovsky, Matthew Jones, S. Choi, W.U. Boeglin, D. Gaskell, E. Christy, Satoshi Nakamura, S. Riordan, Y. Li, A. Daniel, S. Covrig, Whitney Armstrong, Rolf Ent, C. Ellis, Chunhui Chen, O. Rondon, J. Mulholland, Karl Slifer, Z. E. Meziani, K. Kovacs, D. G. Crabb, L. Z. Ndukum, C. E. Keppel, Emil Frlez, M. Elaasar, J. German, M. H. Shabestari, D. Kawama, A. Deur, Wouter Deconinck, D. Flay, V. V. Mochalov, V. Mamyan, O. Ates, Dipanwita Dutta, Ronald Gilman, Pete Markowitz, J. A. Dunne, G. M. Huber, Brian M. Davis, Lubomir Pentchev, P. Solvignon, A. Liyanage, M. Khandaker, J. Gomez, A. Ahmidouch, Douglas Higinbotham, M. K. Jones, B. Sawatzky, L. F. Soloviev, L. G. Tang, Michael Kohl, P. Carter, P. Monaghan, A. Asaturyan, J. P. Chen, Tanja Horn, P. E. Bosted, J. Reinhold, I. Albayrak, A. J. R. Puckett, M. Bychkov, F. R. Wesselmann, Geoffrey Smith, L. El Fassi, V. Tadevosyan, Toshiyuki Gogami, M. Posik, L. Y. Zhu, O. Geagla, N. Kalantarians, A. Davidenko, Dinko Pocanic, Yu.M. Mel'nik, James Maxwell, Y. Goncharenko, H. Yao, Nuruzzaman, S. Danagoulian, Y.H. Kim, Donal Day |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
010308 nuclear & particles physics Scattering media_common.quotation_subject Polarization (waves) 01 natural sciences Asymmetry Uncorrelated Polarized target Nuclear physics Recoil 0103 physical sciences Magnetic form factor High Energy Physics::Experiment Atomic physics Nuclear Experiment 010306 general physics media_common |
| Zdroj: | Physical Review C. 101 |
| ISSN: | 2469-9993 2469-9985 |
| DOI: | 10.1103/physrevc.101.035206 |
| Popis: | The ratio of the electric and magnetic form factor of the proton, $\mu_p G_E^p/G_M^p$, 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 $\mu_p G_E^p/G_M^p$ 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 $\mu_p G_E^p/G_M^p = 0.720 \pm 0.176_{stat} \pm 0.039_{sys}$, 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 $\mu_p G_E^p/G_M^p=0.244\pm0.353_{stat}\pm0.013_{sys}$, which represents the highest $Q^2$ reach with the double spin asymmetry with polarized target to date. |
| Databáze: | OpenAIRE |
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