Abstract
We have studied in the framework of Chiral Perturbation Theory ( χPT) the O ( p 6) vector meson contributions to K → πγγ and K L → γγ ∗ . We construct the most general χPT Lagrangian for the weak vector-pseudoscalar-photon ( VP γ ) vertex for K → πγγ and K L → γγ ∗ and consequently we get the full structure of the O ( p 6) local contributions generated by vector meson exchange. We then compute new factorizable contributions to the weak VPγ vertex generated by the odd-intrinsic parity violating Lagrangian with no additional couplings. We find in fact a very nice agreement with the phenomenology of K → πγγ and K L → γγ ∗ , more predictive power and a deeper understanding of the O ( p 6) local operators. A novel interpretation of the K L → γγ ∗ data is given. Also a comparison with the existing models is presented.
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