J H E P 1 0 ( 2 0 1 2 ) 0 4 2 The H ERMES Collaboration

  title={J H E P 1 0 ( 2 0 1 2 ) 0 4 2 The H ERMES Collaboration},
  author={Avetik Airapetian and Noaryr Akopov and Z. Akopov and E. C. Aschenauer and Wlłodzimierz Augustyniak and Raffie Avakian and Arthur E. Avetissian and Eduard Avetisyan and St. Belostotski and Henk P. Blok and Aldar Borissov and Justine Bowles and Irina Brodski and V. Bryzgalov and Jatu Burns and Marta Capiluppi and Gionata Capitani and Evaristo Cisbani and Giuseppe Ciullo and Marco M. Contalbrigo and Paola F. Dalpiaz and Willem Deconinck and Roberto De Leo and Lorenzo De Nardo and Enzo De Sanctis and Markus Diefenthaler and Pasquale Di Nezza and Michael Dueren and Markus Ehrenfried and Garegin Elbakian and Frank Ellinghaus and Erik Etzelmueller and Ricardo Fabbri and Alessandra Fantoni and L. Felawka and Salvatore Frullani and Galina Gapienko and V. A. Gapienko and Fulvio Garibaldi and Gregory Gavrilov and Vahagn Gharibyan and Francesca Giordano and Stephen Gliske and Mayya Golembiovskaya and Ingrid M. Gregor and Husniye Guler and Martin A. J. Hartig and Delia Hasch and Adrian Hillenbrand and M Michiel Hoek and Yvonne Holler and Ilina Hristova and Alexander Ivanilov and Howard E. Jackson and H. – S. Jo and Susan Joosten and Robin Kaiser and Gevorg Ararat Karyan and Tibor Keri and Elizabeth Kinney and Alexander Kisselev and Vitalii Korotkov and Vladimir A. Kozlov and Benjamin R. Krauss and Pavlo Kravchenko and V. G. Krivokhijine and Luigi Lagamba and L. Lapik{\'a}s and I. Lehmann and Paolo Lenisa and Alejandro L{\'o}pez Ruiz and Wolfgang Lorenzon and Sheng-Jie Lu and X. Lu and Bosacker Ma and Derek Mahon and Naomi C. R. Makins and Serguei Manaenkov and Laura Manfr{\'e} and Yaxian Mao and Bohdan Mariański and Alberto Martinez de la Ossa and Hrachya H. Marukyan and Clark Anson Miller and Yousuke Miyachi and Ashley Movsisyan and Michael Murray and Andreas Mussgiller and E. Nappi and Yu. G. Naryshkin and Andrea Nass and Mikhail Negodaev and W. D. Nowak and Armstrong R.L. Osborne and Luciano Libero Pappalardo and R. P{\'e}rez-Benito and Artem Petrosyan and Paul Edwin Reimer and Anna Rita Reolon and Caroline Riedl and Klaus Rith and Guenther Rosner and Armine Rostomyan and Luk{\'a}{\vs} Rub{\'a}{\vc}ek and Johan Rubin and Dirk Ryckbosch and Andreas Sch{\"a}fer and Gregory Schnell and K. Peter Sch{\"u}ler and Bj{\"o}rn Ingo Seitz and Catherine Forbes Shearer and Tomoko Shibata and Valeriy Shutov and Michele Stancari and Marco Statera and J. J. M. Steijger and Jason Stewart and S. P. Taroian and A. R. Terkulov and Rebecca M. Truty and Aleksander Trzcinski and Michael Tytgat and Yves van Haarlem and Charlotte Van Hulse and Denis Veretennikov and Vi Vikhrov and I. Vilardi and Song Gui Wang and Sergey Yaschenko and Zhen-W. Ye and S. Yen and Vitaly Zagrebelnyy and Dietmar Zeiler and Benedikt Zihlmann and P. Fick D. Zupranski},
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 → epγ events with detection of all particles in the final state including the recoiling… CONTINUE READING


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