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25 April 2024

» arxiv » 1310.5081

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Beam-helicity asymmetry in associated electroproduction of real photons $ep o egamma pi N$ in the $Delta$-resonance region
HERMES Collaboration ; 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 ;
Date:	18 Oct 2013
Abstract:	The beam-helicity asymmetry in associated electroproduction of real photons, $ep o egamma pi N$, 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, $ep o egamma pi^0 p$ and $ep o egamma pi^+ n$, from a data set collected with a recoil detector. All asymmetry amplitudes are found to be consistent with zero.
Source:	arXiv, 1310.5081
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