G{sub E{sub p}}/G{sub M{sub p}} ratio by polarization transfer in e --> p --> ep --

The ratio of the proton's elastic electromagnetic form factors, G{sub E{sub p}}/G{sub M{sub p}} was obtained by measuring P{sub i} and P{sub l}, the transverse and the longitudinal recoil proton polarization, respectively. For elastic ep to ep, G{sub E{sub p}}/G{sub M{sub p}} is proportional to...

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Published in:Physical review letters Vol. 84; no. 7
Main Authors: Jones, Mark, Aniol, Konrad, Baker, F, Bertin, Pierre, Bertozzi, William, Besson, Auguste, Bimbot, Louis, Boeglin, Werner, Brash, Edward, Brown, D, Calarco, John, Cardman, Lawrence, Chen, Jian-Ping, Chudakov, Eugene, Churchwell, Steve, Cisbani, Evaristo, Dale, Daniel, Leo, Raffaele De, Deur, Alexandre, Diederich, Brian, Domingo, John, Epstein, Martin, Ewell, Lars, Fonvieille, Helene, Frullani, Salvatore, Gao, Juncai, Garibaldi, Franco, Gasparian, Ashot, Gerstner, G M, Gilad, Shalev, Gilman, Ronald, Glamazdin, Oleksandr, Glashausser, Charles, Gomez, Javier, Gorbenko, Viktor, Green, Alphonza, Hansen, Jens-Ole, Howell, Calvin, Huber, Garth, Jager, Cornelis de, Jaminion, Stephanie, Jiang, Xiaodong, Kahl, William E, Kelly, James, Khayat, Mohammad, Kramer, Laird, Kumbartzki, Gerfried, Kuss, Michael, Laveissiere, Geraud, LeRose, John, Liang, Meihua, Lindgren, Richard, Liyanage, Nilanga, Lolos, George, Macri, R, Madey, Richard, Malov, Sergey, Margaziotis, Demetrius, Markowitz, Pete, McIntyre, Justin, der Meer, Rob van, Michaels, Robert, Milbrath, Brian, Mougey, Jean, Nanda, Sirish, Offermann, Ed, Papandreou, Zisis, Perdrisat, Charles, Petratos, Gerassimos, Piskunov, Nikolai, Pomatsalyuk, Roman, Prout, David, Punjabi, Vina, Quemener, Gilles, Ransome, Ronald, Raue, Brian, Roche, Julie, Rutledge, Gary, Rutt, Paul, Saha, Arunava, Saito, Teijiro, Sarty, Adam, Smith, T P, Sorokin, P, Strauch, Steffen, Suleiman, Riad, Takahashi, Kazunori, Templon, Jeffrey, Todor, Luminita, Ulmer, Paul, Urciuoli, Guido, Vernin, Pascal, Vlahovic, Branislav, Voskanian, H, Wijesooriya, Krishni, Wojtsekhowski, Bogdan, Woo, Rhett, Xiong, Feng, Zainea, Dan, Zhou, Zilu
Format: Journal Article
Language:English
Published: United States 14-02-2000
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Summary:The ratio of the proton's elastic electromagnetic form factors, G{sub E{sub p}}/G{sub M{sub p}} was obtained by measuring P{sub i} and P{sub l}, the transverse and the longitudinal recoil proton polarization, respectively. For elastic ep to ep, G{sub E{sub p}}/G{sub M{sub p}} is proportional to P{sub t}/P{sub l}. Simultaneous measurement of P{sub t} and P{sub l} in a polarimeter provides good control of the systematic uncertainty. The results for the ratio G{sub E{sub p}}/G{sub M{sub p}} 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.
Bibliography:JLAB-PHY-00-71; DOE/ER/40150-2846; nucl-ex/9910005
USDOE Office of Energy Research (ER) (US)
AC05-84ER40150
ISSN:0031-9007
1079-7114