Search for the decay $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ in the momentum region $P_{\pi }<195MeV/c$

E787 Collaboration

We have searched for the decay $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ in the kinematic region with pion momentum below the $K^{+}\to {\pi }^{+}{\pi }^0$ peak. One event was observed, consistent with the backgro…