Proton elastic form factor ratios to $Q^2$=3.5 GeV$^2$ by polarization transfer

V. Punjabi C.F. Perdrisat K.A. Aniol F.T. Baker J. Berthot 1 P.Y. Bertin 1 W. Bertozzi A. Besson 1 L. Bimbot 2 W.U. Boeglin E.J. Brash D. Brown J.R. Calarco L.S. Cardman Z. Chai C.-C. Chang J.-P. Chen E. Chudakov S. Churchwell E. Cisbani D.S. Dale R. de Leo A. Deur 1 B. Diederich J.J. Domingo M.B. Epstein L.A. Ewell K. G. Fissum A. Fleck H. Fonvieille 1 S. Frullani J. Gao F. Garibaldi A. Gasparian G. Gerstner S. Gilad R. Gilman A. Glamazdin C. Glashausser J. Gomez V. Gorbenko A. Green J.-O. Hansen C.R. Howell G.M. Huber M. Iodice C.W. de Jager S. Jaminion 1 X. Jiang M.K. Jones W. Kahl J.J. Kelly M. Khayat L.H. Kramer G. Kumbartzki M. Kuss E. Lakuriki G. Laveissière 1 J.J. Lerose M. Liang R.A. Lindgren N. Liyanage G.J. Lolos R. Macri R. Madey S. Malov D.J. Margaziotis P. Markowitz K. Mccormick J.I. Mcintyre R.L.J. van der Meer R. Michaels B.D. Milbrath J.Y. Mougey 3 S.K. Nanda E.A.J.M. Offermann Z. Papandreou L. Pentchev G.G. Petratos N.M. Piskunov R.I. Pomatsalyuk D.L. Prout G. Quéméner 3 R.D. Ransome B.A. Raue Y. Roblin 1 R. Roche G. Rutledge P.M. Rutt A. Saha T. Saito A.J. Sarty T.P. Smith P. Sorokin S. Strauch R. Suleiman K. Takahashi J.A. Templon L. Todor P.E. Ulmer G.M. Urciuoli P. Vernin B. Vlahovic H. Voskanyan K. Wijesooriya B.B. Wojtsekhowski R.J. Woo F. Xiong G.D. Zainea Z.-L. Zhou
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.
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Submitted on : Wednesday, May 25, 2005 - 6:21:17 PM
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V. Punjabi, C.F. Perdrisat, K.A. Aniol, F.T. Baker, J. Berthot, et al.. Proton elastic form factor ratios to $Q^2$=3.5 GeV$^2$ by polarization transfer. Physical Review C, American Physical Society, 2005, 71, 055202 (27 p.). ⟨10.1103/PhysRevC.71.055202⟩. ⟨in2p3-00024165⟩

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