/ hep-ex DESY-13-188


Beam-helicity asymmetry in associated electroproduction of real photons $ep \to e\gamma\pi N$ in the $\Delta$-resonance region


Airapetian, A. (Michigan U.) ; Akopov, N. (Yerevan Phys. Inst.) ; Aschenauer, E.C. (DESY) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Avakian, R. (Yerevan Phys. Inst.) ; Avetissian, A. (Yerevan Phys. Inst.) ; Avetisyan, E. (DESY) ; Blok, H.P. (Vrije U., Amsterdam) ; Bottcher, H. (DESY) ; Borissov, A. (DESY) ; Bowles, J. (Glasgow U.) ; Brodski, I. (Giessen U.) ; Bryzgalov, V. (Serpukhov, IHEP) ; Burns, J. (Glasgow U.) ; 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 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) ; Frullani, S. (INFN, Rome) ; Gapienko, G. (Serpukhov, IHEP) ; Gapienko, V. (Serpukhov, IHEP) ; Garcia, J.Garay (Basque U., Bilbao) ; Garibaldi, F. (INFN, Rome) ; Gavrilov, G. (DESY) ; Gharibyan, V. (Yerevan Phys. Inst.) ; Giordano, F. (INFN, Ferrara) ; Gliske, S. (Michigan U.) ; Hartig, M. (DESY) ; Hasch, D. (Frascati) ; Holler, Y. (DESY) ; Hristova, I. (DESY) ; Ivanilov, A. (Serpukhov, IHEP) ; Jackson, H.E. (Argonne) ; Joosten, S. (Illinois U., Urbana) ; 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.) ; 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) ; Lorenzon, W. (Michigan U.) ; Lu, X.G. (DESY) ; Ma, B.Q. (Peking U.) ; Mahon, D. (Glasgow U.) ; Makins, N.C.R. (Illinois U., Urbana) ; Manaenkov, S.I. (St. Petersburg, INP) ; Mao, Y. (Peking U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Marukyan, H. (Yerevan Phys. Inst.) ; Miller, C.A. (TRIUMF) ; Miyachi, Y. (Tokyo Inst. Tech.) ; Movsisyan, A. (INFN, Ferrara) ; Muccifora, V. (Frascati) ; Murray, M. (Glasgow U.) ; Mussgiller, A. (Erlangen - Nuremberg U.) ; Naryshkin, Y. (St. Petersburg, INP) ; Nass, A. (Erlangen - Nuremberg U.) ; Negodaev, M. (DESY) ; Nowak, W.D. (DESY) ; 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) ; Rubin, J. (Illinois U., Urbana) ; Ryckbosch, D. (Gent U.) ; Salomatin, Y. (Serpukhov, IHEP) ; Schafer, A. (Regensburg U.) ; Schnell, G. (Gent U.) ; Seitz, B. (Glasgow U.) ; Shibata, T.A. (Tokyo Inst. Tech.) ; Stahl, M. (Giessen U.) ; Statera, M. (INFN, Ferrara) ; Steffens, E. (Erlangen - Nuremberg U.) ; Steijger, J.J.M. (NIKHEF, Amsterdam) ; Stewart, J. (DESY) ; Stinzing, F. (Erlangen - Nuremberg U.) ; 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.) ; Vikhrov, V. (St. Petersburg, INP) ; Vilardi, I. (INFN, Bari) ; Wang, S. (Peking U.) ; Yaschenko, S. (DESY) ; Ye, Z. (DESY) ; Yen, S. (TRIUMF) ; Zagrebelnyy, V. (Giessen U.) ; Zihlmann, B. (DESY) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies)

Published in: JHEP
Year: 2014
Vol.: 1401
Page No: 077
Pages: 17
Year: 2014

Abstract: The beam-helicity asymmetry in associated electroproduction of real photons, $ep\to e\gamma \pi N$, in the $\Delta$(1232)-resonance region is measured using the longitudinally polarized HERA positron beam and an unpolarized hydrogen target. Azimuthal Fourier amplitudes of this asymmetry are extracted separately for two channels, $ep\to e\gamma \pi^0 p$ and $ep\to e\gamma \pi^+ n$, from a data set collected with a recoil detector. All asymmetry amplitudes are found to be consistent with zero.

Keyword(s): Lepton-Nucleon Scattering ; QCD ; Polarization ; Photon production

Web-Page: http://inspirehep.net/record/1261275/files/figures_chi_ch1.png; http://inspirehep.net/record/1261275/files/figures_chi_ch2.png; http://inspirehep.net/record/1261275/files/figures_fig3.png; http://inspirehep.net/record/1261275/files/figures_fig4.png; http://inspirehep.net/record/1261275/files/figures_qq2_ch1.png; http://inspirehep.net/record/1261275/files/figures_qq2_ch2.png; http://inspirehep.net/record/1261275/files/figures_t_ch1.png; http://inspirehep.net/record/1261275/files/figures_t_ch2.png; http://inspirehep.net/record/1261275/files/figures_xbj_ch1.png; http://inspirehep.net/record/1261275/files/figures_xbj_ch2.png; http://inspirehep.net/record/1261275/files/arXiv:1310.5081.pdf


Note: *Temporary entry*; 17 pages, 4 figures

Total numbers of views: 1590
Numbers of unique views: 699
DOI: 10.1007/JHEP01(2014)077
 Record created 2013-11-11, last modified 2014-02-03


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