Exclusive leptoproduction of real photons on a longitudinally polarised hydrogen target

@article{Airapetian2010ExclusiveLO,
  title={Exclusive leptoproduction of real photons on a longitudinally polarised hydrogen target},
  author={The Hermes collaboration A. 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 Bradley Ball and St. Belostotski and Nicola Cracchi Bianchi and Henk P. Blok and Helmut B Bottcher 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 Pietro 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 Ricardo Fabbri and A. Fabrocini S. Fantoni and L. Felawka and Salvatore Frullani and Darren Gabbert and Galina Gapienko and V. A. Gapienko and Fulvio Garibaldi and Gregory Gavrilov and Vahagn Gharibyan and Francesca Giordano and Stephen V. Gliske and Mayya Golembiovskaya and Cynthia Marie Hadjidakis and Martin A. J. Hartig and Delia Hasch and Glasnevin Hill and Adrian Hillenbrand and M Michiel Hoek and Yvonne Holler and Ilina Hristova and Yoshimitsu Imazu and Alexander Ivanilov and Andrey V. Izotov and Howard E. Jackson and Hong Sik Jo and Susan Joosten and Robin Kaiser and Gevorg Ararat Karyan and Tibor Keri and Elizabeth Kinney and Alexander Kisselev and Natsuka Kobayashi and Vitalii Korotkov and Vladimir A. Kozlov and Polina Kravchenko and V. G. Krivokhijne and Luigi Lagamba and Rachel L. Lamb and L. Lapik{\'a}s and Irina Lehmann and Paolo Lenisa and Loren Alexander Linden-Levy and A. LopezRuiz and Wolfgang Lorenzon and X. Lu and X.-R. Lu and B. Q. Ma and Derek Mahon and N. C. R. Makins and Serguei Manaenkov and Laura Manfr{\'e} and Yaxian Mao and Bohdan Mariański and A De la Ossa and Hrachya H. Marukyan and Clark Anson Miller and Yousuke Miyachi and Anna Movsisyan and Valeria Muccifora and Michael Murray and Andreas Mussgiller and E. Nappi and Yu. G. Naryshkin and Andrea Nass and Mikhail Negodaev and W. D. Nowak and Luciano Libero Pappalardo and R. P{\'e}rez-Benito and Nils Pickert and Marc Raithel and Paul Edwin Reimer and Anna Rita Reolon and Caroline Riedl and Klaus Rith and Guenther Rosner and Armine Rostomyan and Johan Rubin and Dirk Ryckbosch and Yu. Salomatin and Florian Sanftl and Andreas Sch{\"a}fer and Gregory Schnell and Katharina Sch{\"u}ler and Bj{\"o}rn Ingo Seitz and T. A. Shibata and Valeriy Shutov and Michele Stancari and Marco Statera and E. Steffens and J. J. M. Steijger and W. Wiedenmann and John Innzna Stewart and Friedrich Stinzing and S. P. Taroian and A. R. Terkulov and Aleksander Trzcinski and Michael Tytgat and Aude Vandenbroucke and P. van der Nat and Yves van Haarlem and Charlotte Van Hulse and Dmitry Veretennikov and Vi Vikhrov and Ignazio Vilardi and Christoph S. Vogel and Song Gui Wang and Sergey Yaschenko and Hua Ye and Z. -Y. Ye and Steffi Yen and Wenxian Yu and Dietmar Zeiler and Benedikt Zihlmann and P. Fick D. Zupranski},
  journal={Journal of High Energy Physics},
  year={2010},
  volume={2010},
  pages={1-19}
}
Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. From the data are extracted two asymmetries in the azimuthal distribution of produced real photons about the direction of the exchanged virtual photon: $$ {\mathcal{A}_{\text{UL}}} $$ with respect to the target polarisation and $$ {\mathcal{A}_{\text{LL… CONTINUE READING
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