Resonance Contributions to the Electromagnetic Low Energy Constants of Chiral Perturbation Theory
Robert Baur, Res Urech
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(e2 p2), 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.
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