Resonance Contributions to the Electromagnetic Low Energy Constants of Chiral Perturbation Theory

Abstract

The effective chiral Lagrangian of the strong and electromagnetic interactions of the pseudoscalar mesons at low energies depends on a set of low energy constants. We determine the contributions to the electromagnetic coupling constants at order $O(e^2{p}^2)$, which arise from resonances within a photon loop. We give some implications of our results, in particular we discuss in detail the effects on the corrections to Dashen's theorem.

Comments: LaTex (uses epsfig.sty), 35 pages including 3 Postscript figures. The complete paper is also available via anonymous ftp at ftp://www-ttp.physik.uni-karlsruhe.de/ , or via www at http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/ ; slightly enlarged version. Accepted for publication in Nucl. Phys. B