GEp/GMp Ratio by Polarization Transfer in e→p→ep→

Jones, M. K.; 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.; 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.; Fissum, K. G.; 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.; Kahl, W.; Kelly, J. J.; Khayat, M.; Kramer, L. H.; Kumbartzki, G.; Kuss, M.; Lakuriki, E.; Lavessière, 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.; Perdrisat, C. F.; Petratos, G. G.; Piskunov, N. M.; Pomatsalyuk, R. I.; Prout, D. L.; Punjabi, V.; 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.

doi:10.1103/PhysRevLett.84.1398

Title: $G_{E_{p}} / G_{M_{p}}$ Ratio by Polarization Transfer in $\vec{e} p \to e \vec{p}$

Journal Article · Tue Feb 01 00:00:00 EST 2000 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.84.1398· OSTI ID:801496

Jones, M. K.; 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.; Chang, C. -C.; Chen, J. -P.; Chudakov, E.; Churchwell, S.; Cisbani, E.; Dale, D. S.; De Leo, R. more »

The ratio of the proton's elastic electromagnetic form factors, G{sub Ep}/G{sub Mp} was obtained by measuring P{sub t} and P{ell}, the transverse and the longitudinal recoil proton polarization, respectively. For elastic ep {yields} ep, G{sub Ep}/G{sub Mp} is proportional to P{sub t}/P{ell}. Simultaneous measurement of P{sub t} and P{ell} in a polarimeter provides good control of the systematic uncertainty. The results for the ratio G{sub Ep}/G{sub Mp} show a systematic decrease as Q{sup 2} increases from 0.5 to 3.5 GeV{sup 2}, indicating for the first time a definite difference in the spatial distribution of charge and magnetization currents in the proton.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Energy Research (ER) (US)

DOE Contract Number:: AC05-84ER40150

OSTI ID:: 801496

Report Number(s):: JLAB-PHY-00-48; DOE/ER/40150-2180; PRLTAO; TRN: US0205495

Journal Information:: Physical Review Letters, Vol. 84, Issue 7; Other Information: PBD: 14 Feb 2000; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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