Power corrections of off-forward quark distributions and harmonic operators with definite twist

Details Power corrections of off-forward quark distributions and harmonic operators with definite twist Power corrections of off-forward quark distributions and harmonic operators with definite twist

2001-08-06

arxiv.org/abs/hep-ph/0108061v2

Nucl.Phys. B618 (2001) 99-137; Erratum-ibid. B652 (2003) 408

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, Revtex; addition of references, correction of few typos

Scientific paper

10.1016/S0550-3213(01)00518-1

A group theoretical procedure for parametrizing non-forward matrix elements of non-local QCD operators is introduced. The related (two-variable) distribution amplitudes are given as sum over power corrections of the double distributions. For totally symmetric (local) operators the infinite twist decomposition is given completely and for operators with non-trivial symmetry type up to twist 3. The power corrections for most of the phenomenological relevant double distributions and the vector meson wave functions are determined. They may be obtained, by harmonic extension, from the corresponding operators or distribution amplitudes on the light-cone.

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