Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries

Authors

CLAS Collaboration
H. Bagdasaryan, Old Dominion University
S. L. Careccia, Old Dominion University
K. V. Dharmawardane, Old Dominion University
G. E. Dodge, Old Dominion UniversityFollow
G. Gavalian, Old Dominion University
C. E. Hyde, Old Dominion UniversityFollow
H. G. Juengst, Old Dominion University
N. Kalantarians, Old Dominion University
A. Klein, Old Dominion University
A. V. Klimenko, Old Dominion University
S. E. Kuhn, Old Dominion UniversityFollow
J. Lachniet, Old Dominion University
S. Tkachenko, Old Dominion University
L. B. Weinstein, Old Dominion UniversityFollow
J. Zhang, Old Dominion University

Document Type

Article

Publication Date

2008

DOI

10.1103/PhysRevLett.100.162002

Publication Title

Physical Review Letters

Volume

100

Issue

16

Pages

162002 (1-6)

Abstract

The beam-spin asymmetries in the hard exclusive electroproduction of photons on the proton (^→ep→epγ ) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (_xB from 0.11 to 0.58, Q² from 1 to 4.8  GeV², −t from 0.09 to 1.8  GeV²), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A ≃ asinϕ/(1+ccosϕ). This extensive set of data can thus be used to constrain significantly the generalized parton distributions of the nucleon in the valence quark sector.

Comments

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© American Physical Society

Original Publication Citation

Collaboration, C., Girod, F. X., Niyazov, R. A., Avakian, H., Ball, J., Bedlinskiy, I., . . . Zhao, Z. W. (2008). Measurement of deeply virtual Compton scattering beam-spin asymmetries. Physical Review Letters, 100(16), 162002. doi:10.1103/PhysRevLett.100.162002

ORCID

0000-0003-1582-2376 (Dodge), 0000-0001-7282-8120 (Hyde), 0000-0003-2243-6836 (Kuhn), 0000-0001-5416-2900 (Weinstein)

Repository Citation

CLAS Collaboration; Bagdasaryan, H.; Careccia, S. L.; Dharmawardane, K. V.; Dodge, G. E.; Gavalian, G.; Hyde, C. E.; Juengst, H. G.; Kalantarians, N.; Klein, A.; Klimenko, A. V.; Kuhn, S. E.; Lachniet, J.; Tkachenko, S.; Weinstein, L. B.; and Zhang, J., "Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries" (2008). Physics Faculty Publications. 377.
https://digitalcommons.odu.edu/physics_fac_pubs/377