Does the existence of $f_0$ meson enlarge the $K^{+}\to {\pi }^0{\pi }^0{\pi }^0{e}^{+}\nu$ decay probability?

E. K. Karkaryan, V. F. Obraztsov, M. I. Vysotsky

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…