/ Experiment-HEP hep-ex/0605108


The Beam-charge azimuthal asymmetry and deeply virtual compton scattering


Airapetian, A. (Michigan U.) ; Akopov, N. (Yerevan Phys. Inst.) ; Akopov, Z. (Yerevan Phys. Inst.) ; Amarian, M. (Yerevan Phys. Inst.) ; Andrus, A. (Illinois U., Urbana) ; Aschenauer, E.C. (DESY) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Avakian, R. (Yerevan Phys. Inst.) ; Avetissian, A. (Yerevan Phys. Inst.) ; Avetissian, E. (Frascati) ; Bailey, P. (Illinois U., Urbana) ; Balin, D. (St. Petersburg, INP) ; Beckmann, M. (DESY) ; Belostotski, S. (St. Petersburg, INP) ; Bianchi, N. (Frascati) ; Blok, H.P. (Vrije U., Amsterdam) ; Bottcher, H. (DESY) ; Borissov, A. (Glasgow U.) ; Borysenko, A. (Frascati) ; Bouwhuis, M. (Illinois U., Urbana) ; Brull, A. (Unlisted) ; Bryzgalov, V. (Serpukhov, IHEP) ; Capiluppi, M. (Ferrara U.) ; Capitani, G.P. (Frascati) ; Chen, T. (Peking U.) ; Ciullo, G. (Ferrara U.) ; Contalbrigo, M. (Ferrara U.) ; Dalpiaz, P.F. (Ferrara U.) ; Deconinck, W. (Michigan U.) ; De Leo, R. (INFN, Bari) ; Demey, M. (NIKHEF, Amsterdam) ; De Nardo, L. (Alberta U.) ; De Sanctis, E. (Frascati) ; Devitsin, E. (Lebedev Inst.) ; Di Nezza, P. (Frascati) ; Dreschler, J. (NIKHEF, Amsterdam) ; Duren, M. (Giessen U.) ; Ehrenfried, M. (Erlangen - Nuremberg U.) ; Elalaoui-Moulay, A. (Argonne) ; Elbakian, G. (Yerevan Phys. Inst.) ; Ellinghaus, F. (Colorado U.) ; Elschenbroich, U. (Gent U.) ; Fabbri, R. (NIKHEF, Amsterdam) ; Fantoni, A. (Frascati) ; Felawka, L. (TRIUMF) ; Frullani, S. (Rome, ISS) ; Funel, A. (Frascati) ; Gapienko, G. (Serpukhov, IHEP) ; Gapienko, V. (Serpukhov, IHEP) ; Garibaldi, F. (Rome, ISS) ; Garrow, K. (TRIUMF) ; Gaskell, D. (Colorado U.) ; Gavrilov, G. (TRIUMF) ; Gharibyan, V. (Yerevan Phys. Inst.) ; Grebeniouk, O. (St. Petersburg, INP) ; Gregor, I.M. (DESY) ; Hadjidakis, C. (Frascati) ; Hafidi, K. (Argonne) ; Hartig, M. (Giessen U.) ; Hasch, D. (Frascati) ; Hesselink, W.H.A. (Vrije U., Amsterdam) ; Hillenbrand, A. (Erlangen - Nuremberg U.) ; Hoek, M. (Giessen U.) ; Holler, Y. (DESY) ; Hommez, B. (Gent U.) ; Hristova, I. (DESY) ; Iarygin, G. (Dubna, JINR) ; Ivanilov, A. (Serpukhov, IHEP) ; Izotov, A. (St. Petersburg, INP) ; Jackson, H.E. (Argonne) ; Jgoun, A. (St. Petersburg, INP) ; Kaiser, R. (Glasgow U.) ; Kinney, E. (Colorado U.) ; Kisselev, A. (St. Petersburg, INP) ; Kobayashi, T. (Tokyo Inst. Tech.) ; Kopytin, M. (DESY) ; Korotkov, V. (Serpukhov, IHEP) ; Kozlov, V. (Lebedev Inst.) ; Krauss, B. (Erlangen - Nuremberg U.) ; Krivokhijine, V.G. (Dubna, JINR) ; Lagamba, L. (INFN, Bari) ; Lapikas, L. (NIKHEF, Amsterdam) ; Laziev, A. (Vrije U., Amsterdam) ; Lenisa, P. (Ferrara U.) ; Liebing, P. (DESY) ; Linden-Levy, L.A. (Illinois U., Urbana) ; Lorenzon, W. (Michigan U.) ; Lu, H. (Hefei, CUST) ; Lu, J. (TRIUMF) ; Lu, S. (Giessen U.) ; Ma, B.-Q. (Peking U.) ; Maiheu, B. (Gent U.) ; Makins, N.C.R. (Illinois U., Urbana) ; Mao, Y. (Peking U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Marukyan, H. (Yerevan Phys. Inst.) ; Masoli, F. (Ferrara U.) ; Mexner, V. (NIKHEF, Amsterdam) ; Meyners, N. (DESY) ; Michler, T. (Erlangen - Nuremberg U.) ; Mikloukho, O. (St. Petersburg, INP) ; Miller, C.A. (TRIUMF) ; Miyachi, Y. (Tokyo Inst. Tech.) ; Muccifora, V. (Frascati) ; Murray, M. (Glasgow U.) ; Nagaitsev, A. (Dubna, JINR) ; Nappi, E. (INFN, Bari) ; Naryshkin, Y. (St. Petersburg, INP) ; Negodaev, M. (DESY) ; Nowak, W.-D. (DESY) ; Oganessyan, K. (Frascati) ; Ohsuga, H. (Tokyo Inst. Tech.) ; Osborne, A. (Glasgow U.) ; Pickert, N. (Erlangen - Nuremberg U.) ; Potterveld, David H. (Argonne) ; Raithel, M. (Erlangen - Nuremberg U.) ; Reggiani, D. (Erlangen - Nuremberg U.) ; Reimer, P.E. (Argonne) ; Reischl, A. (NIKHEF, Amsterdam) ; Reolon, A.R. (Frascati) ; Riedl, C. (Erlangen - Nuremberg U.) ; Rith, K. (Erlangen - Nuremberg U.) ; Rosner, G. (Glasgow U.) ; Rostomyan, A. (Yerevan Phys. Inst.) ; Rubacek, L. (Giessen U.) ; Rubin, J. (Illinois U., Urbana) ; Ryckbosch, D. (Gent U.) ; Salomatin, Y. (Serpukhov, IHEP) ; Sanjiev, I. (St. Petersburg, INP) ; Savin, Igor A. (Dubna, JINR) ; Schafer, A. (Regensburg U.) ; Schnell, G. (Tokyo Inst. Tech.) ; Schuler, K.P. (DESY) ; Seele, J. (Colorado U.) ; Seidl, R. (Erlangen - Nuremberg U.) ; Seitz, B. (Giessen U.) ; Shanidze, R. (Erlangen - Nuremberg U.) ; Shearer, C. (Glasgow U.) ; Shibata, T.-A. (Tokyo Inst. Tech.) ; Shutov, V. (Dubna, JINR) ; Sinram, K. (DESY) ; Sommer, W. (Giessen U.) ; Stancari, M. (Ferrara U.) ; Statera, M. (Ferrara U.) ; Steffens, E. (Erlangen - Nuremberg U.) ; Steijger, J.J.M. (NIKHEF, Amsterdam) ; Stenzel, H. (Giessen U.) ; Stewart, J. (DESY) ; Stinzing, F. (Erlangen - Nuremberg U.) ; Tait, P. (Erlangen - Nuremberg U.) ; Tanaka, H. (Tokyo Inst. Tech.) ; Taroian, S. (Yerevan Phys. Inst.) ; Tchuiko, B. (Serpukhov, IHEP) ; Terkulov, A. (Lebedev Inst.) ; Trzcinski, A. (Warsaw, Inst. Nucl. Studies) ; Tytgat, M. (Gent U.) ; Vandenbroucke, A. (Gent U.) ; van der Nat, P.B. (NIKHEF, Amsterdam) ; van der Steenhoven, G. (NIKHEF, Amsterdam) ; van Haarlem, Y. (Gent U.) ; Vikhrov, V. (St. Petersburg, INP) ; Vincter, M.G. (Alberta U.) ; Vogel, C. (Erlangen - Nuremberg U.) ; Volmer, J. (DESY) ; Wang, S. (Peking U.) ; Wendland, J. (TRIUMF) ; Ye, Y. (Hefei, CUST) ; Ye, Z. (DESY) ; Yen, S. (TRIUMF) ; Zihlmann, B. (Gent U.) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies)

Published in: Phys.Rev.
Year: 2007
Vol.: D75
Page No: 011103
Pages: 5

Abstract: The first observation of an azimuthal cross--section asymmetry with respect to the charge of the incoming lepton beam is reported from a study of hard exclusive electroproduction of real photons. The data have been accumulated by the HERMES experiment at DESY, in which the HERA 27.6 GeV electron or positron beam scattered off an unpolarized hydrogen gas target. The observed asymmetry is attributed to the interference between the Bethe--Heitler process and the Deeply Virtual Compton Scattering (DVCS) process. The interference term is sensitive to DVCS amplitudes, which provide the most direct access to Generalized Parton Distributions.

Web-Page: http://link.aps.org/abstract/PRD/V75/E011103

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