Generalized polarizabilities of the pion in chiral perturbation theory

C. Unkmeir, S. Scherer, A. I. L'vov, D. Drechsel

Published 1999-04-23Version 1

We present a calculation of the virtual Compton scattering amplitude for $\gamma^\ast+\pi\to \gamma+\pi$ in the framework of chiral perturbation theory at ${\cal O}(p^4)$. We explicitly derive expressions for generalized electromagnetic polarizabilities and discuss alternative definitions of these quantities.