G{sub Ep}/G{sub Mp} ratio by polarization transfer in ep {yields} ep

M. K. Jones,K. A. Aniol,F.T. Baker,J. Berthot,Pierre Bertin,W. Bertozzi,A. Besson,L. Bimbot,W. Boeglin,Ed Brash,D. Brown,Larry S. Cardman John Calarco,C. C. Chang,Jian-Ping Chen,E. Chudakov, Steve Churchwell,E. Cisbani,D. Dale,R. De Leo,A. Deur,B. Diederich,J. Domingo,M. B. Epstein, L. A. Ewell,Kevin Fissum,A. Fleck,H. Fonvieille,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,Günter Huber,M. Iodice, Kees de Jager,S. Jaminion,X Jiang, W. Kahl,J. J. Kelly,M. Khayat,L. Kramer,G. Kumbartzki,M. Kuss, E. Lakuriki,G. Lavessiere,J. J. LeRose,M. Liang,R. Lindgren,N. Liyanage,G. J. Lolos,R. Macri,R. Madey,S. Malov,D. J. Margaziotis,P. Markowitz,Kathy McCormick,Justin I. McIntyre,R. L. J. van der Meer,R. Michaels, Brian D. Milbrath,J. Mougey,S. Nanda, E.A.J.M. Offerman,Z. Papandreou,Charles F. Perdrisat,G.G. Petratos,N.M. Piskunov,R. Pomatsalyuk,D. L. Prout,Vina Punjabi,G. Quéméner,R. D. Ransome,B. A. Raue,Y. Roblin,R. Roche,G. Rutledge,P. M. Rutt,Arun Saha,T. Saito,A. J. Sarty,T. Smith,P. Sorokin,Steffen Strauch,R. Suleiman,Kazunori Takahashi,J.A. Templon,L. Todor,P. E. Ulmer, Guido Marie Urciuoli,P. Vernin,B. Vlahovic,H. Voskanyan,K. Wijesooriya,B. Wojtsekhowski,R.J. Woo,F. Xiong, George Dan Zainea,Z.-L. Zhou

Physical Review Letters（2000）

Cited 23|Views14

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Abstract

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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Key words

Electronic Structure Calculations,Electron–Phonon Coupling

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