2007

Deeply Virtual Compton Scattering Beam-Spin Asymmetries

Girod, F. X., al, R. A. Niyazov et

Understand

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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