Measurement of the branching ratio of the $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ decay

NA62 Collaboration

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