Consequences of a weak vector boson for the decay K→μ+ν+γ

Consequences of an intermediate vector boson, with arbitrary anomalous magnetic and quadrupole moments, have been investigated for the decay K→μ+ν+γ. The results of a numerical calculation indicate that such a boson will have observable effects if its mass is not too great. Emission of photons at large backward angles with respect to energetic muons is significantly enhanced. Emission of high-energy photons at small forward angles is suppressed. The dependence of these effects on the mass and magnetic moment of the boson is discussed. Photon polarization phenomena are noted.