Scheme dependence of NLO corrections to exclusive processes

Details Scheme dependence of NLO corrections to exclusive processes Scheme dependence of NLO corrections to exclusive processes

1998-12-23

arxiv.org/abs/hep-ph/9812490v2

Phys.Rev. D59 (1999) 116003

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTeX, 25 pages, 2 figures, 5 tables, minor changes, to be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.59.116003

We apply the so-called conformal subtraction scheme to predict perturbatively exclusive processes beyond leading order. Taking into account evolution effects, we study the scheme dependence for the photon-to-pion transition form factor and the electromagnetic pion form factor at next-to-leading order for different pion distribution amplitudes. Relying on the conformally covariant operator product expansion and using the known higher order results for polarized deep inelastic scattering, we are able to predict perturbative corrections to the hard-scattering amplitude of the photon-to-pion transition form factor beyond next-to-leading order in the conformal scheme restricted to the conformal limit of the theory.

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