Measurements of the elastic electromagnetic form factor ratio μpgep/gmp via polarization transfer

O. Gayou, K. Wijesooriya, A. Afanasev, M. Amarian, K. Aniol, S. Becher, K. Benslama, L. Bimbot, P. Bosted, E. Brash, J. Calarco, Z. Chai, C. C. Chang, T. Chang, J. P. Chen, S. Choi, E. Chudakov, S. Churchwell, D. Crovelli, S. DieterichS. Dumalski, D. Dutta, M. Epstein, K. Fissum, B. Fox, S. Frullani, H. Gao, J. Gao, F. Garibaldi, R. Gilman, S. Glamazdin, C. Glashausser, J. Gomez, V. Gorbenko, O. Hansen, R. J. Holt, J. Hovdebo, G. M. Huber, C. W. De Jager, X. Jiang, C. Jones, M. K. Jones, J. Kelly, E. Kinney, E. Kooijman, G. Kumbartzki, M. Kuss, J. LeRose, M. Liang, R. Lindgren, N. Liyanage, S. Malov, D. J. Margaziotis, P. Markowitz, K. McCormick, D. Meekins, Z. E. Meziani, R. Michaels, J. Mitchell, L. Morand, C. F. Perdrisat, R. Pomatsalyuk, V. Punjabi, R. D. Ransome, R. Roche, M. Rvachev, A. Saha, A. Sarty, E. C. Schulte, D. Simon, S. Strauch, R. Suleiman, L. Todor, P. E. Ulmer, G. M. Urciuoli, B. Wojtsekhowski, F. Xiong, W. Xu

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Abstract

We present measurements of the ratio of the proton elastic electromagnetic form factors, μpGEp/GMp . The Jefferson Lab Hall A Focal Plane Polarimeter was used to determine the longitudinal and transverse components of the recoil proton polarization in ep elastic scattering; the ratio of these polarization components is proportional to the ratio of the two form factors. These data reproduce the observation of Jones et al. [Phys. Rev. Lett. 84, 1398 (2000)], that the form factor ratio decreases significantly from unity above Q2 =1 GeV2.

Original languageEnglish (US)
Article number038202
Pages (from-to)382021-382024
Number of pages4
JournalPhysical Review C - Nuclear Physics
Volume64
Issue number3
DOIs
StatePublished - Sep 2001

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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