EFFECTIVE LAGRANGIANS FOR Z-BOSON DECAY INTO PHOTONS

The lowest-dimensional effective Lagrangians describing the decay of a neutral massive vector boson Z into three photons are considered. We restrict ourselves a priori to the parity-conserving interactions. The corresponding tree-level decay rate is calculated for a general effec tive Lagrangian of such a type. We thus get a generalization of some e arlier results appearing in the literature.