Exploratory Lattice QCD Study of the Rare Kaon Decay $K^{+}\to {\pi }^{+}\nu \bar{\nu }$

Ziyuan Bai, Norman H. Christ, Xu Feng +3

We report a first, complete lattice QCD calculation of the long-distance contribution to the $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ decay within the standard model. This is a second-order weak process…