Breakdown of chiral expansion for parton distributions

Abstract

In the framework of the chiral perturbation theory we computed two- and three-loop corrections to the pion parton distributions which posses $\delta$-function singularities at x->0. This calculation explicitly demonstrates that in the region of small x ~ mpi^2/(4 pi F)^2 standard ChPT breaks down and one needs resummation of all orders. We give an example of such resummation.

10 pages, 7 figures

References in corpus (1)

• Generalized parton distributions for the nucleon in chiral perturbation theory

Cited by in corpus (1)

• Leading Chiral Logarithms for Pion Form Factors to Arbitrary Number of Loops