/ Experiment-HEP arXiv:1206.5683


Beam-helicity asymmetry arising from deeply virtual Compton scattering measured with kinematically complete event reconstruction


Airapetian, A. (Michigan U.) ; Akopov, N. (Yerevan Phys. Inst.) ; Akopov, Z. (DESY) ; Aschenauer, E.C. (DESY) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Avakian, R. (Yerevan Phys. Inst.) ; Avetissian, A. (Yerevan Phys. Inst.) ; Avetisyan, E. (DESY) ; Belostotski, S. (St. Petersburg, INP) ; Blok, H.P. (Vrije U., Amsterdam) ; Borissov, A. (DESY) ; Bowles, J. (Glasgow U.) ; Brodski, I. (Giessen U.) ; Bryzgalov, V. (Serpukhov, IHEP) ; Burns, J. (Glasgow U.) ; Capiluppi, M. (INFN, Ferrara) ; Capitani, G.P. (Frascati) ; Cisbani, E. (INFN, Rome) ; Ciullo, G. (INFN, Ferrara) ; Contalbrigo, M. (INFN, Ferrara) ; Dalpiaz, P.F. (INFN, Ferrara) ; Deconinck, W. (DESY) ; De Leo, R. (INFN, Bari) ; De Nardo, L. (Gent U.) ; De Sanctis, E. (Frascati) ; Diefenthaler, M. (Erlangen - Nuremberg U.) ; Di Nezza, P. (Frascati) ; Duren, M. (Giessen U.) ; Ehrenfried, M. (Giessen U.) ; Elbakian, G. (Yerevan Phys. Inst.) ; Ellinghaus, F. (Colorado U.) ; Etzelmuller, E. (Giessen U.) ; Fabbri, R. (DESY) ; Fantoni, A. (Frascati) ; Felawka, L. (TRIUMF) ; Frullani, S. (INFN, Rome) ; Gapienko, G. (Serpukhov, IHEP) ; Gapienko, V. (Serpukhov, IHEP) ; Garibaldi, F. (INFN, Rome) ; Gavrilov, G. (DESY) ; Gharibyan, V. (Yerevan Phys. Inst.) ; Giordano, F. (INFN, Ferrara) ; Gliske, S. (Michigan U.) ; Golembiovskaya, M. (DESY) ; Gregor, I.M. (DESY) ; Guler, H. (DESY) ; Hartig, M. (DESY) ; Hasch, D. (Frascati) ; Hillenbrand, A. (DESY) ; Hoek, M. (Glasgow U.) ; Holler, Y. (DESY) ; Hristova, I. (DESY) ; Ivanilov, A. (Serpukhov, IHEP) ; Jackson, H.E. (Argonne) ; Joosten, S. (Illinois U., Urbana) ; Jo, H.S. (Gent U.) ; Kaiser, R. (Glasgow U.) ; Karyan, G. (Yerevan Phys. Inst.) ; Keri, T. (Giessen U.) ; Kinney, E. (Colorado U.) ; Kisselev, A. (St. Petersburg, INP) ; Korotkov, V. (Serpukhov, IHEP) ; Kozlov, V. (Lebedev Inst.) ; Krauss, B. (Erlangen - Nuremberg U.) ; Kravchenko, P. (St. Petersburg, INP) ; Krivokhijine, V.G. (Dubna, JINR) ; Lagamba, L. (INFN, Bari) ; Lapikas, L. (NIKHEF, Amsterdam) ; Lehmann, I. (Glasgow U.) ; Lenisa, P. (INFN, Ferrara) ; Lopez Ruiz, A. (Gent U.) ; Lorenzon, W. (Michigan U.) ; Lu, S. (Giessen U.) ; Lu, X. (DESY) ; Ma, B.Q. (Peking U.) ; Mahon, D. (Glasgow U.) ; Makins, N.C.R. (Illinois U., Urbana) ; Manaenkov, S.I. (St. Petersburg, INP) ; Manfre, L. (INFN, Rome) ; Mao, Y. (Peking U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Martinez de la Ossa, A. (Colorado U.) ; Marukyan, H. (Yerevan Phys. Inst.) ; Miller, C.A. (TRIUMF) ; Miyachi, Y. (Tokyo Inst. Tech.) ; Movsisyan, A. (Yerevan Phys. Inst.) ; Murray, M. (Glasgow U.) ; Mussgiller, A. (Erlangen - Nuremberg U.) ; Nappi, E. (INFN, Bari) ; Naryshkin, Y. (St. Petersburg, INP) ; Nass, A. (Erlangen - Nuremberg U.) ; Negodaev, M. (DESY) ; Nowak, W.D. (DESY) ; Osborne, A. (Glasgow U.) ; Pappalardo, L.L. (INFN, Ferrara) ; Perez-Benito, R. (Giessen U.) ; Petrosyan, A. (Yerevan Phys. Inst.) ; Reimer, P.E. (Argonne) ; Reolon, A.R. (Frascati) ; Riedl, C. (DESY) ; Rith, K. (Erlangen - Nuremberg U.) ; Rosner, G. (Glasgow U.) ; Rostomyan, A. (DESY) ; Rubacek, L. (Giessen U.) ; Rubin, J. (Illinois U., Urbana) ; Ryckbosch, D. (Gent U.) ; Schafer, A. (Regensburg U.) ; Schnell, G. (Gent U.) ; Schuler, K.P. (DESY) ; Seitz, B. (Glasgow U.) ; Shearer, C. (Glasgow U.) ; Shibata, T.A. (Tokyo Inst. Tech.) ; Shutov, V. (Dubna, JINR) ; Stancari, M. (INFN, Ferrara) ; Statera, M. (INFN, Ferrara) ; Steijger, J.J.M. (NIKHEF, Amsterdam) ; Stewart, J. (DESY) ; Taroian, S. (Yerevan Phys. Inst.) ; Terkulov, A. (Lebedev Inst.) ; Truty, R. (Illinois U., Urbana) ; Trzcinski, A. (Warsaw, Inst. Nucl. Studies) ; Tytgat, M. (Gent U.) ; Van Haarlem, Y. (Gent U.) ; Van Hulse, C. (Gent U.) ; Veretennikov, D. (St. Petersburg, INP) ; Vikhrov, V. (St. Petersburg, INP) ; Vilardi, I. (INFN, Bari) ; Wang, S. (Peking U.) ; Yaschenko, S. (Erlangen - Nuremberg U.) ; Ye, Z. (DESY) ; Yen, S. (TRIUMF) ; Zagrebelnyy, V. (Michigan U.) ; Zeiler, D. (Erlangen - Nuremberg U.) ; Zihlmann, B. (DESY) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies)

Abstract: The beam-helicity asymmetry in exclusive electroproduction of real photons by the longitudinally polarized HERA positron beam scattering off an unpolarized hydrogen target is measured at HERMES. The asymmetry arises from deeply virtual Compton scattering and its interference with the Bethe--Heitler process. Azimuthal amplitudes of the beam-helicity asymmetry are extracted from a data sample consisting of $ep\rightarrow ep\gamma$ events with detection of all particles in the final state including the recoiling proton. The installation of a recoil detector, while reducing the acceptance of the experiment, allows the elimination of resonant background that was estimated to contribute an average of about 12% to the signal in previous {\sc Hermes} publications. The removal of the resonant background from the present data sample is shown to increase the magnitude of the leading asymmetry amplitude by $0.054\pm 0.016$ to $-0.328\pm 0.027(stat.)\pm 0.045(syst.)$.

Keyword(s): lepton-nucleon scattering

Web-Page: http://inspirehep.net/record/1119568/files/arXiv:1206.5683.pdf; http://inspirehep.net/record/1119568/files/figures_Amplitudes-all-three.png; http://inspirehep.net/record/1119568/files/figures_Fractions.png; http://inspirehep.net/record/1119568/files/figures_Pure-with-models.png; http://inspirehep.net/record/1119568/files/figures_Recoil.png; http://inspirehep.net/record/1119568/files/figures_angles_2.png; http://inspirehep.net/record/1119568/files/figures_bh.png; http://inspirehep.net/record/1119568/files/figures_dvcs.png; http://inspirehep.net/record/1119568/files/figures_momres.png; http://inspirehep.net/record/1119568/files/figures_mx2_dvcs_data-vs-mc.png; http://inspirehep.net/record/1119568/files/figures_mx2_dvcs_three_samples.png; http://inspirehep.net/record/1119568/files/figures_phires.png; http://inspirehep.net/record/1119568/files/figures_thetares.png


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