Comment on soft-pion emission in DVCS

Details Comment on soft-pion emission in DVCS Comment on soft-pion emission in DVCS

2005-03-08

arxiv.org/abs/hep-ph/0503076v1

J.Phys. G31 (2005) B7-B10

Physics

High Energy Physics

High Energy Physics - Phenomenology

2 pages, RevTeX

Scientific paper

10.1088/0954-3899/31/7/B01

The soft-pion theorem for pion production in deeply virtual Compton scattering, derived by Guichon, Mosse and Vanderhaegen, is shown to be consistent with chiral perturbation theory. Chiral symmetry requires that the nonsinglet operators corresponding to spin-independent and spin-dependent parton distributions have the same anomalous dimensions in cases where those operators are related by chiral transformations. In chiral perturbation theory, their scale-dependences can thus be absorbed in the coefficents of the corresponding effective operators, without affecting their chiral structures.

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