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4th International Workshop on Quantum Chromodynamics and Hadronic Physics, Paris : France (1998)
Exclusive electroproduction and off-diagonal parton distributions
M. Diehl1, T. Gousset2, B. Pire3

Off-diagonal parton distributions occur in several hard exclusive reactions. They extend the study of hadron structure beyond what can be learned from ordinary distributions and have a particularly rich spin structure. The hard scattering subprocesses in electroproduction of mesons and of real photons satisfy helicity selection rules, which provide powerful tools to test leading-twist dominance at a given value of the hard scale.
1 :  SPhN - Service de Physique Nucléaire
2 :  SUBATECH - Laboratoire SUBATECH Nantes
3 :  CPHT - Centre de Physique Théorique
Physique/Physique des Hautes Energies - Phénoménologie
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