Beam-Helicity Asymmetry In Associated Electroproduction Of Real Photons Ep -> Aeuro Parts Per Thousand E Gamma Pi N In The Delta-Resonance Region

A. Airapetian, N. Akopov, E. C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, H. P. Blok, H. Boettcher, A. Borissov, J. Bowles, I. Brodski, V. Bryzgalov,J. Burns, G. P. Capitani, E. Cisbani, G. Ciullo,M. Contalbrigo, P. F. Dalpiaz, W. Deconinck, R. De Leo, E. De Sanctis, M. Diefenthaler,P. Di Nezza, M. Dueren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, E. Etzelmueller, R. Fabbri, S. Frullani, G. Gapienko,V. Gapienko,J. Garay Garcia,F. Garibaldi,G. Gavrilov, V. Gharibyan,F. Giordano, S. Gliske, M. Hartig, D. Hasch, Y. Holler, I. Hristova,A. Ivanilov,H. E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney,A. Kisselev,V. Korotkov, V. Kozlov, P. Kravchenko, V. G. Krivokhijine, L. Lagamba,L. Lapikas, I. Lehmann, P. Lenisa, W. Lorenzon, X. -G. Lu,B. -Q. Ma, D. Mahon, N. C. R. Makins, S. I. Manaenkov, Y. Mao,B. Marianski, H. Marukyan,C. A. Miller,Y. Miyachi, A. Movsisyan, V. Muccifora, M. Murray, A. Mussgiller, Y. Naryshkin, A. Nass, M. Negodaev,W. -D. Nowak, L. L. Pappalardo, R. Perez-Benito, A. Petrosyan, P. E. Reimer,A. R. Reolon, C. Riedl, K. Rith, G. Rosner, Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, A. Schaefer,G. Schnell, B. Seitz,T. -A. Shibata, M. Stahl, M. Statera, E. Steffens,J. J. M. Steijger,J. Stewart, F. Stinzing, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat,Y. Van Haarlem,C. Van Hulse, V. Vikhrov, I. Vilardi,S. Wang, S. Yaschenko, Z. Ye,S. Yen, V. Zagrebelnyy, B. Zihlmann, P. Zupranski

JOURNAL OF HIGH ENERGY PHYSICS（2014）

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Abstract

The beam-helicity asymmetry in associated electroproduction of real photons, ep -> aEuro parts per thousand 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 -> aEuro parts per thousand e gamma pi(0) p and ep -> aEuro parts per thousand e gamma pi(+) n, from a data set collected with a recoil detector. All asymmetry amplitudes are found to be consistent with zero.

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Key words

Lepton-Nucleon Scattering,QCD,Polarization,Photon production

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