ROLE OF VECTOR-MESONS IN RARE KAON DECAYS

We study the role of vector mesons in K --> pi-pi, K --> pi-l+ l-, K(L) --> gamma-l+ l-, and K(L) --> pi-0-gamma-gamma using the chiral Lagrangian in the hidden-symmetry scheme with the Wess-Zumino anomaly. Two main features of our approach are (i) the slight modification of the effective weak chiral Lagrangian and (ii) the existence of the anomalous left-handed current constructed from the Wess-Zumino anomaly and intrinsic parity-violating interactions involving vector mesons. We predict that the decay mode K(L) --> pi-0e+ e- is dominated by the indirect CP-violating one-photon-exchange process, which occurs at the level of a few parts in 10(10) in the branching ratio. We can also understand the recent data on K(L) --> gamma-e+ e- and K(L) --> pi-0-gamma-gamma in our framework, except for the branching ratio of K(L) --> pi-0-gamma-gamma.