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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, Aasinφ/(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.
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Girod et al. (2008) studied this question.
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