Beam-helicity asymmetry in associated electroproduction of real photons ep → eγπN in the Δ-resonance region

A. Airapetian,N. Akopov,E. C. Aschenauer,W. Augustyniak, R. Avakian,A. Avetissian,E. Avetisyan,H. P. Blok,H. Böttcher,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. Düren,M. Ehrenfried,G. Elbakian,F. Ellinghaus,E. Etzelmüller,R. Fabbri,S. Frullani,G. Gapienko,V. Gapienko,J. Garay García,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. Lapikás,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,A. Rostomyan,J. Rubin,D. Ryckbosch,Y. Salomatin,A. Schäfer,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

bstract The beam-helicity asymmetry in associated electroproduction of real photons, ep → e γπ N , in the Δ(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 → e γπ 0 p and ep → e γπ + 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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