Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements

S. Stepanyan, V. D. Burkert, L. Elouadrhiri, G. S. Adams, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Audit, T. Auger, H. Avakian, J. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, P. Bertin, N. Bianchi, A. Biselli, S. Boiarinov, B. E. BonnerS. Bouchigny, D. Branford, W. K. Brooks, J. R. Calarco, D. S. Carman, B. Carnahan, L. Ciciani, P. L. Cole, A. Coleman, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. Cummings, P. V. Degtiarenko, H. Denizli, L. C. Dennis, E. De Sanctis, R. DeVita, K. V. Dharmawardane, C. Djalali, G. E. Dodge, D. Doré, D. Doughty, P. Dragovitsch, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, A. Empl, R. Fatemi, R. J. Feuerbach, J. Ficenec, K. Fissum, T. A. Forest, A. P. Freyberger, H. Funsten, S. Gaff, M. Gai, M. Garçon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. Giovanetti, P. Girard, K. A. Griffioen, M. Guidal, M. Guillo, V. Gyurjyan, C. Hadjidakis, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, M. M. Ito, D. Jenkins, K. Joo, J. Kelley, M. Khandaker, D. H. Kim, K. Kim, K. Y. Kim, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, L. H. Kramer, S. E. Kuhn, J. M. Laget, D. Lawrence, A. Longhi, K. Lukashin, J. J. Manak, C. Marchand

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Abstract

The first measurement of the beam-spin asymmetry in exclusive electroproduction of real photons in the deeply inelastic regime was performed. A large asymmetry with sinφ modulation was observed as predicted by the interference of deeply virtual Compton scattering (DVCS) and the Bethe-Heitler process. The amplitude of the modulation was calculated to be about α=0.202±0.028. α was found to be directly proportional to the imaginary part of the DVCS amplitude, in leading-order and leading-twist perturbative quantum chromodynamic (QCD) corrections.
Original languageEnglish
Pages (from-to)1820021-1820025
Number of pages5
JournalPhysical Review Letters
Publication statusPublished - 29 Oct 2001
Externally publishedYes

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    Stepanyan, S., Burkert, V. D., Elouadrhiri, L., Adams, G. S., Anciant, E., Anghinolfi, M., Asavapibhop, B., Audit, G., Auger, T., Avakian, H., Ball, J., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Bertin, P., Bianchi, N., Biselli, A., Boiarinov, S., ... Marchand, C. (2001). Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements. Physical Review Letters, 1820021-1820025. https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0035968836&origin=inward