/ Experiment-Nucl nucl-ex/0501018

Proton elastic form-factor ratios to Q**2 = 3.5-GeV**2 by polarization transfer

Punjabi, V. (Norfolk State U.) ; Perdrisat, C.F. (William-Mary Coll.) ; Aniol, K.A. (Cal State, L.A.) ; Baker, F.T. (Georgia U.) ; Berthot, J. (Clermont-Ferrand U.) ; Bertin, P.Y. (Clermont-Ferrand U.) ; Bertozzi, W. (MIT, LNS) ; Besson, A. (Clermont-Ferrand U.) ; Bimbot, L. (Orsay, IPN) ; Boeglin, W.U. (Florida Intl. U.) ; Brash, E.J. (Jefferson Lab) ; Brown, D. (Maryland U.) ; Calarco, J.R. (New Hampshire U.) ; Cardman, L.S. (Jefferson Lab) ; Chai, Z. (MIT, LNS) ; Chang, C.C. (Maryland U.) ; Chen, Jian-Ping. (Jefferson Lab) ; Chudakov, E. (Jefferson Lab) ; Churchwell, S. (Duke U.) ; Cisbani, E. (INFN, Rome) ; Dale, Daniel S. (Kentucky U.) ; De Leo, R. (Bari U.) ; Deur, A. (Jefferson Lab) ; Diederich, B. (Old Dominion U.) ; Domingo, J.J. (Jefferson Lab) ; Epstein, M.B. (Cal State, L.A.) ; Ewell, L.A. (Maryland U.) ; Fissum, K.G. (MIT, LNS) ; Fleck, A. (Regina U.) ; Fonvieille, H. (Clermont-Ferrand U.) ; Frullani, S. (INFN, Rome) ; Gao, J. (MIT, LNS) ; Garibaldi, F. (INFN, Rome) ; Gasparian, A. (Kentucky U.) ; Gerstner, G. (William-Mary Coll.) ; Gilad, S. (MIT, LNS) ; Gilman, Ronald A. (Jefferson Lab) ; Glamazdin, A. (Kharkov, KIPT) ; Glashausser, C. (Rutgers U., Piscataway) ; Gomez, J. (Jefferson Lab) ; Gorbenko, V. (Kharkov, KIPT) ; Green, A. (Western Cape U.) ; Hansen, J.O. (Jefferson Lab) ; Howell, C.R. (Duke U.) ; Huber, G.M. (Regina U.) ; Iodice, M. (INFN, Rome) ; de Jager, C.W. (Jefferson Lab) ; Jaminion, S. (Clermont-Ferrand U.) ; Jiang, X. (Rutgers U., Piscataway) ; Jones, M.K. (Jefferson Lab) ; Kahl, W. (Syracuse U.) ; Kelly, J.J. (Maryland U.) ; Khayat, M. (Kent State U.) ; Kramer, L.H. (Florida Intl. U.) ; Kumbartzki, G. (Rutgers U., Piscataway) ; Kuss, M. (Jefferson Lab) ; Lakuriki, E. (Temple U.) ; Laveissiere, G. (Clermont-Ferrand U.) ; LeRose, J.J. (Jefferson Lab) ; Liang, M. (Jefferson Lab) ; Lindgren, R.A. (Virginia U.) ; Liyanage, N. (Virginia U.) ; Lolos, G.J. (Regina U.) ; Macri, R. (Duke U.) ; Madey, R. (Hampton U.) ; Malov, S. (Rutgers U., Piscataway) ; Margaziotis, D.J. (Cal State, L.A.) ; Markowitz, P. (Florida Intl. U.) ; McCormick, K. (Rutgers U., Piscataway) ; McIntyre, J.I. (Rutgers U., Piscataway) ; van der Meer, R.L.J. (Regina U.) ; Michaels, R. (Jefferson Lab) ; Milbrath, B.D. (Eastern Kentucky U.) ; Mougey, J.Y. (LPSC, Grenoble) ; Nanda, S.K. (Jefferson Lab) ; Offermann, E.A.J.M. (Jefferson Lab) ; Papandreou, Z. (Regina U.) ; Pentchev, L. (William-Mary Coll.) ; Petratos, G.G. (Kent State U.) ; Piskunov, N.M. (Dubna, JINR) ; Pomatsalyuk, R.I. (Kharkov, KIPT) ; Prout, D.L. (Kent State U.) ; Quemener, G. (LPSC, Grenoble) ; Ransome, R.D. (Rutgers U., Piscataway) ; Raue, B.A. (Florida Intl. U.) ; Roblin, Y. (Jefferson Lab) ; Roche, R. (Old Dominion U.) ; Rutledge, G. (William-Mary Coll.) ; Rutt, P.M. (Jefferson Lab) ; Saha, A. (Jefferson Lab) ; Saito, T. (Tohoku U.) ; Sarty, A.J. (Florida State U.) ; Smith, T.P. (New Hampshire U.) ; Sorokin, P. (Kharkov, KIPT) ; Strauch, S. (William-Mary Coll.) ; Suleiman, R. (MIT, LNS) ; Takahashi, K. (Tohoku U.) ; Templon, J.A. (Georgia U.) ; Todor, L. (Old Dominion U.) ; Ulmer, P.E. (Old Dominion U.) ; Urciuoli, G.M. (INFN, Rome) ; Vernin, P. (Saclay) ; Vlahovic, B. (North Carolina Central U.) ; Voskanyan, H. (Yerevan Phys. Inst.) ; Wijesooriya, K. (William-Mary Coll.) ; Wojtsekhowski, B.B. (Jefferson Lab) ; Woo, R.J. (Manitoba U.) ; Xiong, F. (MIT, LNS) ; Zainea, G.D. (Regina U.) ; Zhou, Z.L. (MIT, LNS)

Published in: Phys.Rev. / Erratum-ibid.
Year: 2005 / 2005
Vol.: C71 / C71
Page No: 055202 / 069902
Pages: 31

Abstract: The ratio of the proton elastic electromagnetic form factors, $G_{Ep}/G_{Mp}$, was obtained by measuring $P_{t}$ and $P_{\ell}$, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic $\vec e p \to e\vec p$ ~reaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV$^2$. In the single-photon exchange approximation, the ratio $G_{Ep}/G_{Mp}$ is directly proportional to the ratio $P_t/P_{\ell}$. The simultaneous measurement of $P_{t}$ and $P_{\ell}$ in a polarimeter reduces systematic uncertainties. The results for the ratio $G_{Ep}/G_{Mp}$ show a systematic decrease with increasing $Q^2$, indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been re-analyzed and systematic uncertainties have become significantly smaller than previously published results.

Web-Page: http://dx.doi.org/10.1103/PhysRevC.71.055202; http://www1.jlab.org/Ul/publications/view_pub.cfm?pub_id=5896; http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=837157; http://link.aps.org/abstract/PRC/V71/E055202

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