Two-photon decays of , and
Physik Department, Technische Universität München, D-85747, Garching, Germany
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We investigate the decays of and into two photons in an effective U(3) chiral Lagrangian approach without employing large- arguments. Tree level and one-loop contributions from the anomalous Wess-Zumino-Witten Lagrangian are calculated and the importance of - mixing is discussed. Unitarity corrections beyond one loop play an important role for the decays with off-shell photons and are included by employing a coupled-channel Bethe-Salpeter equation which satisfies unitarity constraints and generates vector mesons from composed states of two pseudoscalar mesons.
© Società Italiana di Fisica and Springer-Verlag, 2004