2010

Exclusive electroproduction revisited: treating kinematical effects

Belitsky, A. V., Mueller, D.

Understand

Generalized parton distributions of the nucleon are accessed via exclusive leptoproduction of the real photon.

  • While earlier analytical considerations of phenomenological observables were restricted to twist-three accuracy, i.e., taking into account only terms suppressed by a single power of the hard scale, in the present study we revisit this differential cross section within the helicity formalism and restore power-suppressed effects stemming from the process kinematics exactly.
  • We restrict ourselves to the phenomenologically important case of lepton scattering off a longitudinally polarized nucleon, where the photon flips its helicity at most by one unit.

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