Deeply Virtual Compton Scattering Beam-Spin Asymmetries

Details Deeply Virtual Compton Scattering Beam-Spin Asymmetries Deeply Virtual Compton Scattering Beam-Spin Asymmetries

2007-11-29

arxiv.org/abs/0711.4805v3

Phys.Rev.Lett.100:162002,2008

Physics

High Energy Physics

High Energy Physics - Experiment

1 tex file (6 pages), 4 (eps) figures

Scientific paper

10.1103/PhysRevLett.100.162002

The beam spin asymmetries in the hard exclusive electroproduction of photons on the proton (ep -> epg) 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 (x_B from 0.11 to 0.58, Q^2 from 1 to 4.8 GeV^2, -t from 0.09 to 1.8 GeV^2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A = a*sin(phi)/[1+c*cos(phi)]. 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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