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Measurement of the beam spin azimuthal asymmetry associated with deeply virtual Compton scattering
Airapetian, A. ; Akopov, N. ; Akopov, Z. ; Amarian, M. ; Aschenauer, E. C. ; Avakian, H. ; Avakian, R. ; Avetissian, A. ; Avetissian, E. ; Bailey, P. ; Bains, B. ; Baturin, V. ; Baumgarten, C. ; Beckmann, M. ; Belostotski, S. ; Bernreuther, S. ; Bianchi, N. ; Bottcher, H. ; Borissov, A. ; Bouhali, O. ; Bouwhuis, M. ; Brack, J. ; Brauksiepe, S. ; Bruckner, W. ; Brull, A. ; Brunn, I. ; Bulten, H. J. ; Capitani, G. P. ; Chumney, P. ; Cisbani, E. ; Ciullo, G. ; Court, G. R. ; Dalpiaz, P. F. ; De Leo, R. ; De Nardo, L. ; De Sanctis, E. ; De Schepper, D. ; Devitsin, E. ; de Witt Huberts, P. K. A. ; Di Nezza, P. ; Duren, M. ; Ehrenfried, M. ; Elbakian, G. ; Ellinghaus, F. ; Ely, J. ; Fabbri, R. ; Fantoni, A. ; Fechtchenko, A. ; Felawka, L. ; Filippone, B. W. ; Fischer, H. ; Fox, B. ; Franz, J. ; Frullani, S. ; Garber, Y. ; Garibaldi, F. ; Garutti, E. ; Gavrilov, G. ; Gharibyan, V. ; Golendukhin, A. ; Graw, G. ; Grebeniouk, O. ; Green, P. W. ; Greeniaus, L. G. ; Gute, A. ; Haeberli, W. ; Hafidi, K. ; Hartig, M. ; Hasch, D. ; Heesbeen, D. ; Heinsius, F. H. ; Henoch, M. ; Hertenberger, R. ; Hesselink, W. H. A. ; Hofman, G. ; Holler, Y. ; Holt, R. J. ; Hommez, B. ; Iarygin, G. ; Izotov, A. ; Jackson, H. E. ; Jgoun, A. ; Jung, P. ; Kaiser, R. ; Kanesaka, J. ; Kinney, E. ; Kisselev, A. ; Kitching, P. ; Kobayashi, H. ; Koch, N. ; Konigsmann, K. ; Kolster, H. ; Korotkov, V. ; Kotik, E. ; Kozlov, V. ; Krauss, B. ; Krivokhijine, V. G. ; Kyle, G. ; Lagamba, L. ; Laziev, A. ; Lenisa, P. ; Liebing, P. ; Lindemann, T. ; Lorenzon, W. ; Maas, A. ; Makins, N. C. R. ; Marukyan, H. ; Masoli, F. ; McAndrew, M. ; McIlhany, K. ; Meissner, F. ; Menden, F. ; Meyners, N. ; Mikloukho, O. ; Miller, C. A. ; Milner, R. ; Muccifora, V. ; Mussa, R. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Nass, A. ; Negodaeva, K. ; Nowak, W.-D. ; Oganessyan, K. ; O'Neill, T. G. ; Owen, B. R. ; Pate, S. F. ; Potashov, S. ; Potterveld, D. H. ; Raithel, M. ; Rakness, G. ; Rappoport, V. ; Redwine, R. ; Reggiani, D. ; Reolon, A. R. ; Rith, K. ; Robinson, D. ; Rostomyan, A. ; Ruh, M. ; Ryckbosch, D. ; Sakemi, Y. ; Sanjiev, I. ; Sato, F. ; Savin, I. ; Scarlett, C. ; Schafer, A. ; Schill, C. ; Schmidt, F. ; Schnell, G. ; Schuler, K. P. ; Schwind, A. ; Seibert, J. ; Seitz, B. ; Shibata, T.-A. ; Shutov, V. ; Simani, M. C. ; Simon, A. ; Sinram, K. ; Steffens, E. ; Steijger, J. J. M. ; Stewart, J. ; Stosslein, U. ; Suetsugu, K. ; Taroian, S. ; Terkulov, A. ; Tessarin, S. ; Thomas, E. ; Tipton, B. ; Tytgat, M. ; Urciuoli, G. M. ; van den Brand, J. F. J. ; van Steenhoven, G. ; van Vyver, R. ; van Hunen, J. J. ; Vetterli, M. C. ; Vikhrov, V. ; Vincter, M. G. ; Visser, J. ; Weiskopf, C. ; Wendland, J. ; Wilbert, J. ; Wise, T. ; Yen, S. ; Yoneyama, S. ; Zohrabian, H. ; HERMES Collaboration (Collaboration author)DESY*
2001
APS
College Park, Md.
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Please use a persistent id in citations: doi:10.1103/PhysRevLett.87.182001 doi:10.3204/PUBDB-2017-02187
Report No.: DESY-01-091; hep-ex/0106068
Abstract: The beam-spin asymmetry in hard electroproduction of photons has been measured for the first time. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an unpolarized hydrogen gas target. The asymmetry in the azimuthal distribution of the produced photons in the angle phi relative to the lepton scattering plane was determined with respect to the helicity state of the incoming positron beam. The beam-spin analyzing power in the sin(phi) moment was measured to be -0.23 +/- 0.04(stat) +/- 0.03(syst) in the missing-mass range below 1.7 GeV. The observed asymmetry is attributed to the interference of the Bethe-Heitler and deeply-virtual Compton scattering processes.
Keyword(s): positron p: deep inelastic scattering ; positron: polarized beam ; polarization: longitudinal ; Compton scattering: off-shell ; photon: electroproduction ; angular distribution: asymmetry ; helicity: dependence ; analyzing power ; approximation: Bethe-Heitler ; interference ; HERMES ; experimental results ; DESY HERA Stor ; 26.7 GeV
Note: HERMES
Contributing Institute(s):
- DESY Retrocat (DESY(-2012))
Research Program(s):
- 899 - ohne Topic (POF3-899) (POF3-899)
Experiment(s):
- HERA: HERMES
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