Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual compton scattering

HERMES Collaboration

doi:10.1103/PhysRevLett.87.182001

Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual compton scattering

HERMES Collaboration

A. Alikhanian Yerevan Institute of Physics
Istituto Superiore di Sanita
German Electron Synchrotron
National Institute for Nuclear Physics
University of Illinois
RAS - Saint Petersburg Nuclear Physics Institute
Ludwig Maximilian University of Munich
University of Freiburg
Institute of Science Tokyo
University of Michigan, Ann Arbor
National Institute for Subatomic Physics
University of Colorado Boulder
Max Planck Institute for Nuclear Physics
Massachusetts Institute of Technology
Friedrich-Alexander University Erlangen-Nürnberg
Vrije Universiteit Amsterdam
New Mexico State University
University of Ferrara
University of Liverpool
University of Alberta
Argonne National Laboratory
RAS - P.N. Lebedev Physics Institute
Joint Institute for Nuclear Research
Simon Fraser University
California Institute of Technology
University of Wisconsin-Madison
Ghent University
University of Regensburg

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The beam-spin asymmetry in hard electroproduction of photons has been measured. 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 φ 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 sinφ 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.

Original language	English
Pages (from-to)	182001
Number of pages	1
Journal	Physical Review Letters
Volume	87
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.87.182001
Publication status	Published - 1 Jan 2001
Externally published	Yes

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10.1103/PhysRevLett.87.182001

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@article{2ad9d1b8726b4a65a24bf48d53f5a4f8,

title = "Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual compton scattering",

abstract = "The beam-spin asymmetry in hard electroproduction of photons has been measured. 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 φ 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 sinφ 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.",

author = "\{HERMES Collaboration\} and A. Airapetian and N. Akopov and Z. Akopov and M. Amarian and Aschenauer, \{E. C.\} and H. Avakian and R. Avakian and A. Avetissian and E. Avetissian and P. Bailey and B. Bains and V. Baturin and C. Baumgarten and M. Beckmann and S. Belostotski and S. Bernreuther and N. Bianchi and H. B{\"o}ttcher and A. Borissov and O. Bouhali and M. Bouwhuis and J. Brack and S. Brauksiepe and W. Br{\"u}ckner and A. Br{\"u}ll and I. Brunn and Bulten, \{H. J.\} and Capitani, \{G. P.\} and P. Chumney and E. Cisbani and G. Ciullo and Court, \{G. R.\} and Dalpiaz, \{P. F.\} and \{De Leo\}, R. and \{De Nardo\}, L. and \{De Sanctis\}, E. and \{De Schepper\}, D. and E. Devitsin and \{de Witt Huberts\}, \{P. K.A.\} and \{Di Nezza\}, P. and M. D{\"u}ren and M. Ehrenfried and G. Elbakian and F. Ellinghaus and J. Ely and R. Fabbri and A. Fantoni and A. Fechtchenko and L. Felawka and Filippone, \{B. W.\}",

year = "2001",

month = jan,

day = "1",

doi = "10.1103/PhysRevLett.87.182001",

language = "English",

volume = "87",

pages = "182001",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "18",

}

TY - JOUR

T1 - Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual compton scattering

AU - HERMES Collaboration

AU - Airapetian, A.

AU - Akopov, N.

AU - Akopov, Z.

AU - Amarian, M.

AU - Aschenauer, E. C.

AU - Avakian, H.

AU - Avakian, R.

AU - Avetissian, A.

AU - Avetissian, E.

AU - Bailey, P.

AU - Bains, B.

AU - Baturin, V.

AU - Baumgarten, C.

AU - Beckmann, M.

AU - Belostotski, S.

AU - Bernreuther, S.

AU - Bianchi, N.

AU - Böttcher, H.

AU - Borissov, A.

AU - Bouhali, O.

AU - Bouwhuis, M.

AU - Brack, J.

AU - Brauksiepe, S.

AU - Brückner, W.

AU - Brüll, A.

AU - Brunn, I.

AU - Bulten, H. J.

AU - Capitani, G. P.

AU - Chumney, P.

AU - Cisbani, E.

AU - Ciullo, G.

AU - Court, G. R.

AU - Dalpiaz, P. F.

AU - De Leo, R.

AU - De Nardo, L.

AU - De Sanctis, E.

AU - De Schepper, D.

AU - Devitsin, E.

AU - de Witt Huberts, P. K.A.

AU - Di Nezza, P.

AU - Düren, M.

AU - Ehrenfried, M.

AU - Elbakian, G.

AU - Ellinghaus, F.

AU - Ely, J.

AU - Fabbri, R.

AU - Fantoni, A.

AU - Fechtchenko, A.

AU - Felawka, L.

AU - Filippone, B. W.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - The beam-spin asymmetry in hard electroproduction of photons has been measured. 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 φ 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 sinφ 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.

AB - The beam-spin asymmetry in hard electroproduction of photons has been measured. 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 φ 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 sinφ 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.

UR - https://www.scopus.com/pages/publications/85037188462

U2 - 10.1103/PhysRevLett.87.182001

DO - 10.1103/PhysRevLett.87.182001

M3 - Article

AN - SCOPUS:85037188462

SN - 0031-9007

VL - 87

SP - 182001

JO - Physical Review Letters

JF - Physical Review Letters

IS - 18

ER -

Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual compton scattering

Abstract

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