Observation of the $K^{+}\to \ddot{I}{€}^{+}\hat{I}½\bar{\hat{I}}½$ decay and measurement of its branching ratio

NA62 Collaboration

A measurement of the $K^{+}\to \ddot{I}{€}^{+}\hat{I}½\bar{\hat{I}}½$ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, a…