Proton elastic form factor ratios to $Q^2$=3.5 GeV$^2$ by polarization transfer
- Punjabi, V.
- Perdrisat, C.F.
- Aniol, K.A.
- Baker, F.T.
- Berthot, J.
- Bertin, P.Y.
- Bertozzi, W.
- Besson, A.
- Bimbot, L.
- Boeglin, W.U.
- Brash, E.J.
- Brown, D.
- Calarco, J.R.
- Cardman, L.S.
- Chai, Z.
- Chang, C.-C.
- Chen, J.-P.
- Chudakov, E.
- Churchwell, S.
- Cisbani, E.
- Dale, D.S.
- De Leo, R.
- Deur, A.
- Diederich, B.
- Domingo, J.J.
- Epstein, M.B.
- Ewell, L.A.
- G. Fissum, K.
- Fleck, A.
- Fonvieille, H.
- Frullani, S.
- Gao, J.
- Garibaldi, F.
- Gasparian, A.
- Gerstner, G.
- Gilad, S.
- Gilman, R.
- Glamazdin, A.
- Glashausser, C.
- Gomez, J.
- Gorbenko, V.
- Green, A.
- Hansen, J.-O.
- Howell, C.R.
- Huber, G.M.
- Iodice, M.
- De Jager, C.W.
- Jaminion, S.
- Jiang, X.
- Jones, M.K.
- Kahl, W.
- Kelly, J.J.
- Khayat, M.
- Kramer, L.H.
- Kumbartzki, G.
- Kuss, M.
- Lakuriki, E.
- Laveissière, G.
- LeRose, J.J.
- Liang, M.
- Lindgren, R.A.
- Liyanage, N.
- Lolos, G.J.
- Macri, R.
- Madey, R.
- Malov, S.
- Margaziotis, D.J.
- Markowitz, P.
- McCormick, K.
- McIntyre, J.I.
- Van Der Meer, R.L.J.
- Michaels, R.
- Milbrath, B.D.
- Mougey, J.Y.
- Nanda, S.K.
- Offermann, E.A.J.M.
- Papandreou, Z.
- Pentchev, L.
- Petratos, G.G.
- Piskunov, N.M.
- Pomatsalyuk, R.I.
- Prout, D.L.
- Quéméner, G.
- Ransome, R.D.
- Raue, B.A.
- Roblin, Y.
- Roche, R.
- Rutledge, G.
- Rutt, P.M.
- Saha, A.
- Saito, T.
- Sarty, A.J.
- Smith, T.P.
- Sorokin, P.
- Strauch, S.
- Suleiman, R.
- Takahashi, K.
- Templon, J.A.
- Todor, L.
- Ulmer, P.E.
- Urciuoli, G.M.
- Vernin, P.
- Vlahovic, B.
- Voskanyan, H.
- Wijesooriya, K.
- Wojtsekhowski, B.B.
- Woo, R.J.
- Xiong, F.
- Zainea, G.D.
- Zhou, Z.-L.
DOIAbstract
PHASEThe 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 magnet...
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