Abstract
A tensorial coupling in the effective weak hamiltonian has been observed in a recent experiment on the decay π − → e − veγ . The coupling constant for this interaction is about 10 6 times the one predicted by the standard model. If this effect really exists in the ΔS=0 effective weak hamiltonian, we suggest that an analogous kind of interaction may exist in the ΔS=1 sector. The decays K + → e + ν e γ and K + → μ + ν μ γ are reanalysed in the light of a possible tensorial coupling in the ΔS=1 effective hamiltonian. If this new effect exists also in the ΔS=1 sector, with the same coupling as in the ΔS=0 sector, and if it is suppressed by the Cabibbo angle, then it can be easily observed at the DAPHNE laboratory in the μ decay of the K +. If this effect is not suppressed by the Cabibbo angle, then also the electron channel is very good for detecting it.
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