Measurement of the branching ratio of the $K^{+}\to \ddot{I}{€}^{+}\hat{I}½\bar{\hat{I}}½$ decay

NA62 Collaboration

The NA62 experiment has measured the branching ratio of the rare decay $K^{+}\to \ddot{I}{€}^{+}\hat{I}½\bar{\hat{I}}½$ using data collected in 2023 and 2024 at the CERN SPS, obtaining ${\rm B}_{\rm 2023-2024…