Abstract
All O(1/ Q 2) corrections to leptoproduction are described by a small number of generalized multiparton distribution functions which depend only on the longitudinal momentum of the partons. We show that these functions can be represented (in A + = 0 gauge) by sequential emission or absorption by the target of quarks, antiquarks and gluons where (i) all quanta move with 0 ⩽ k +/ p + ⩽ 1; (ii) all intermediate hadronic states are on-mass-shell; (iii) no graphs are semi-disconnected with respect to the target or the intermediate hadronic state. We show how all O(1/ Q 2) corrections to the forward virtual Compton amplitude can be represented in terms of these parton distributions.
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