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Exclusive rho(0) electroproduction on the proton at CLAS RID E-8618-2010

Author:: Morrow, S. A. Guidal, M. Garcon, M. Laget, J. M. Smith, E. S. Adams, G. Adhikari, K. P. Aghasyan, M. Amaryan, M. J. Anghinolfi, M. Asryan, G. Audit, G. Avakian, H. Bagdasaryan, H. Baillie, N. Ball, J. P. Baltzell, N. A. Barrow, S. Battaglieri, M. Bedlinskiy, I. Bektasoglu, M. Bellis, M. Benmouna, N. Berman, B. L. Biselli, A. S. Blaszczyk, L. Bonner, B. E. Bookwalter, C. Bouchigny, S. Boiarinov, S. Bradford, R. Branford, D. Briscoe, W. J. Brooks, W. K. Bueltmann, S. Burkert, V. D. Butuceanu, C. Calarco, J. R. Careccia, S. L. Carman, D. S. Carnahan, B. Casey, L. Cazes, A. Chen, S. Cheng, L. Cole, P. L. Collins, P. Coltharp, P. Cords, D. Corvisiero, P. Crabb, D. Crannell, H. Crede, V. Cummings, J. P. Dale, D. Dashyan, N. De Masi, R. De Vita, R. De Sanctis, E. Degtyarenko, P. V. Denizli, H. Dennis, L. Deur, A. Dhamija, S. Dharmawardane, K. V. Dhuga, K. S. Dickson, R. Didelez, J. -P. Djalali, C. Dodge, G. E. Doughty, D. Dugger, M. Dytman, S. Dzyubak, O. P. Egiyan, H. Egiyan, K. S. El Fassi, L. Elouadrhiri, L. Eugenio, P. Fatemi, R. Fedotov, G. Fersch, R. Feuerbach, R. J. Forest, T. A. Fradi, A. Gavalian, G. Gevorgyan, N. Gilfoyle, G. P. Giovanetti, K. L. Girod, F. X. Goetz, J. T. Gohn, W. Gordon, C. I. O. Gothe, R. W. Graham, L. Griffioen, K. A. Guillo, M. Guler, N. Guo, L. Gyurjyan, V. Hadjidakis, C. Hafidi, K. Hakobyan, H. Hanretty, C. Hardie, J. Hassall, N. Heddle, D. Hersman, F. W. Hicks, K. Hleiqawi, I. Holtrop, M. Hourany, E. Hyde-Wright, C. E. Ilieva, Y. Ireland, D. G. Ishkhanov, B. S. Isupov, E. L. Ito, M. M. Jenkins, D. Jo, H. S. Johnstone, J. R. Joo, K. Juengst, H. G. Kalantarians, N. Keller, D. Kellie, J. D. Khandaker, M. Khetarpal, P. Kim, W. Klein, A. Klein, F. J. Klimenko, A. V. Kossov, M. Kramer, L. H. Kubarovsky, V. Kuhn, J. Kuhn, S. E. Kuleshov, S. V. Kuznetsov, V. Lachniet, J. Langheinrich, J. Lawrence, D. Li, Ji Livingston, K. Lu, H. Y. MacCormick, M. Marchand, C. Markov, N. Mattione, P. McAleer, S. McCracken, M. McKinnon, B. McNabb, J. W. C. Mecking, B. A. Mehrabyan, S. Melone, J. J. Mestayer, M. D. Meyer, C. A. Mibe, T. Mikhailov, K. Minehart, R. Mirazita, M. Miskimen, R. Mokeev, V. Morand, L. Moreno, B. Moriya, K. Moteabbed, M. Mueller, J. Munevar, E. Mutchler, G. S. Nadel-Turonski, P. Nasseripour, R. Niccolai, S. Niculescu, G. Niculescu, I. Niczyporuk, B. B. Niroula, M. R. Niyazov, R. A. Nozar, M. O'Rielly, G. V. Osipenko, M. Ostrovidov, A. I. Park, K. Park, S. Pasyuk, E. Paterson, C. Pereira, S. Anefalos Philips, S. A. Pierce, J. Pivnyuk, N. Pocanic, D. Pogorelko, O. Polli, E. Popa, I. Pozdniakov, S. Preedom, B. M. Price, J. W. Procureur, S. Prok, Y. Protopopescu, D. Qin, L. M. Raue, B. A. Riccardi, G. Ricco, G. Ripani, M. Ritchie, B. G. Rosner, G. Rossi, P. Rubin, P. D. Sabatie, F. Saini, M. S. Salamanca, J. Salgado, C. Santoro, J. P. Sapunenko, V. Schott, D. Schumacher, R. A. Serov, V. S. Sharabian, Y. G. Sharov, D. Shvedunov, N. V. Skabelin, A. V. Smith, L. C. Sober, D. I. Sokhan, D. Stavinsky, A. Stepanyan, S. S. Stepanyan, S. Stokes, B. E. Stoler, P. Strakovsky, I. I. Strauch, S. Taiuti, M. Tedeschi, D. J. Tkabladze, A. Tkachenko, S. Todor, L. Tur, C. Ungaro, M. Vineyard, M. F. Vlassov, A. V. Watts, D. P. Weinstein, L. B. Weygand, D. P. Williams, M. Wolin, E. Wood, M. H. Yegneswaran, A. Yurov, M. Zana, L. Zhang, J. Zhao, B. Zhao, Z. W.
Journal:: EUROPEAN PHYSICAL JOURNAL A
Issue Date:: 2009
Abstract(summary):: The ep -> e'pp(0) reaction has been measured using the 5.754 GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross-sections are presented. The W, Q(2) and t dependences of the cross-section are compared to theoretical calculations based on the t-channel meson-exchange Regge theory, on the one hand, and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the approximate to 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high-energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present.
Page:: 5---31

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