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Exclusive electroproduction and off-diagonal parton distributions

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arxiv hep-ph/9811220 v1 pith:XEV5QJM6 submitted 1998-11-02 hep-ph

classification hep-ph
keywords distributionshardelectroproductionexclusiveoff-diagonalpartonstructurebeyond
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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