Proton elastic form factor ratios to Q2=3.5GeV2 by polarization transfer
The ratio of the proton elastic electromagnetic form factors, GEp/GMp, was obtained by measuring Pt and P, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic e→p→ep→ reaction in the four-momentum transfer squared range of 0.5 to 3.5GeV2. In the single-photon exchange approximation, GEp/GMp is directly proportional to Pt/P. The simultaneous measurement of Pt and P in a polarimeter reduces systematic uncertainties. The results for GEp/GMp show a systematic decrease with increasing Q2, indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been reanalyzed and their systematic uncertainties have become significantly smaller than those reported previously. © 2005 The American Physical Society.
Punjabi, V; Perdrisat, CF; Aniol, KA; Baker, FT; Berthot, J; Bertin, PY; Bertozzi, W; Besson, A; Bimbot, L; Boeglin, WU; Brash, EJ; Brown, D; Calarco, JR; Cardman, LS; Chai, Z; Chang, CC; Chen, JP; Chudakov, E; Churchwell, S; Cisbani, E; Dale, DS; de Leo, R; Deur, A; Diederich, B; Domingo, JJ; Epstein, MB; Ewell, LA; Fissum, KG; 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, JO; Howell, CR; Huber, GM; Iodice, M; de Jager, CW; Jaminion, S; Jiang, X; Jones, MK; Kahl, W; Kelly, JJ; Khayat, M; Kramer, LH; Kumbartzki, G; Kuss, M; Lakuriki, E; Laveissière, G; LeRose, JJ; Liang, M; Lindgren, RA; Liyanage, N; Lolos, GJ; Macri, R; Madey, R; Malov, S; Margaziotis, DJ; Markowitz, P; McCormick, K; McIntyre, JI; van der Meer, RLJ; Michaels, R; Milbrath, BD; Mougey, JY; Nanda, SK; Offermann, EAJM; Papandreou, Z; Pentchev, L; Petratos, GG; Piskunov, NM; Pomatsalyuk, RI; Prout, DL; Quéméner, G; Ransome, RD; Raue, BA; Roblin, Y; Roche, R; Rutledge, G; Rutt, PM; Saha, A; Saito, T; Sarty, AJ; Smith, TP; Sorokin, P; Strauch, S; Suleiman, R; Takahashi, K; Templon, JA; Todor, L; Ulmer, PE
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