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. De Vita, 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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report the first results of the beam-spin asymmetry measured in the reaction e→p → epγ at a beam energy of 4.25 GeV. A large asymmetry with a sinφ modulation is observed, as predicted for the interference term of deeply virtual compton scattering (DVCS) and the Bethe-Heitler process. The amplitude of this modulation is α=0.202±0.028. In leading-order and leading-twist perturbative QCD, the α is directly proportional to the imaginary part of the DVCS amplitude. © 2001 The American Physical Society.
Original languageEnglish
Pages (from-to)182002
Number of pages1
JournalPhysical Review Letters
DOIs
Publication statusPublished - 1 Jan 2001
Externally publishedYes

Fingerprint Dive into the research topics of 'Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements'. Together they form a unique fingerprint.

  • Cite this

    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., ... Klusman, M. (2001). Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements. Physical Review Letters, 182002. https://doi.org/10.1103/PhysRevLett.87.182002