Does the Existence of the f0 Meson Increase the K+ → π0π0π0e+ν Decay Probability?

Abstract

We estimate a possible contribution of the two-pion system \({{f}_{0}}(500)\) wide resonance to the decay probability of the super rare decay \({{K}^{ + }} \to 3{{\pi }^{0}}{{e}^{ + }}\nu \). We vary the width of the resonance from 0.01 to 1000 MeV. We found that the contribution of the narrow resonance in a system of several final state particles into the decay probability is proportional to its width. However it never exceeds the value of the decay probability calculated on free final state particles neglecting the resonance contribution.