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

University of California at Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90095, CLAS Collaboration

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report the first results of the beam-spin asymmetry measured in the reaction ep → 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.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review Letters
Volume87
Issue number18
DOIs
StatePublished - Jan 1 2001

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asymmetry
electron beams
modulation
scattering
scattering amplitude
quantum chromodynamics
interference
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

University of California at Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90095, & CLAS Collaboration (2001). Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements. Physical Review Letters, 87(18). https://doi.org/10.1103/PhysRevLett.87.182002

Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements. / University of California at Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90095; CLAS Collaboration.

In: Physical Review Letters, Vol. 87, No. 18, 01.01.2001.

Research output: Contribution to journalArticle

University of California at Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90095 & CLAS Collaboration 2001, 'Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements', Physical Review Letters, vol. 87, no. 18. https://doi.org/10.1103/PhysRevLett.87.182002
University of California at Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90095, CLAS Collaboration. Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements. Physical Review Letters. 2001 Jan 1;87(18). https://doi.org/10.1103/PhysRevLett.87.182002
University of California at Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90095 ; CLAS Collaboration. / Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements. In: Physical Review Letters. 2001 ; Vol. 87, No. 18.
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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.",
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AU - Elouadrhiri, L.

AU - Adams, G. S.

AU - Anciant, E.

AU - Anghinolfi, M.

AU - Asavapibhop, B.

AU - Audit, G.

AU - Auger, T.

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AU - Ball, J.

AU - Barrow, S.

AU - Battaglieri, M.

AU - Beard, K.

AU - Bektasoglu, M.

AU - Bertin, P.

AU - Bianchi, N.

AU - Biselli, A.

AU - Boiarinov, S.

AU - Bonner, B. E.

AU - Bouchigny, S.

AU - Branford, D.

AU - Brooks, W. K.

AU - Calarco, J. R.

AU - Carman, D. S.

AU - Carnahan, B.

AU - Ciciani, L.

AU - Cole, P. L.

AU - Coleman, A.

AU - Cords, D.

AU - Corvisiero, P.

AU - Crabb, D.

AU - Crannell, H.

AU - Cummings, J.

AU - Degtiarenko, P. V.

AU - Denizli, H.

AU - Dennis, L. C.

AU - De Sanctis, E.

AU - De Vita, R.

AU - Dharmawardane, K. V.

AU - Djalali, C.

AU - Dodge, G. E.

AU - Doré, D.

AU - Doughty, D.

AU - Dragovitsch, P.

AU - Dytman, S.

AU - Eckhause, M.

AU - Egiyan, H.

AU - Egiyan, K. S.

AU - Ritchie, Barry

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N2 - 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.

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