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)

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