TTP96-54 Resonance Contributions to the Electromagnetic Low Energy Constants of Chiral Perturbation Theory

TTP96-54 Resonance Contributions to the Electromagnetic Low Energy Constants of Chiral Perturbation Theory

TTP96-54 Resonance Contributions to the Electromagnetic Low Energy Constants of Chiral Perturbation Theory

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.

Robert Baur and Res Urech
Nucl. Phys. B 499 319-348 1997
PDF PostScript arXiv