Speaker
Description
The $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay is a golden mode for flavour physics. Its branching ratio is predicted with high precision by the Standard Model to be less than $10^{-10}$, and this decay mode is highly sensitive to indirect effects of new physics up to the highest mass scales. Using data collected in 2016--2022 NA62 announced the first observation of this decay with a significance in excess of 5 sigma. New results from the analysis of the 2023--2024 dataset are presented. This dataset doubles the effective sample size. Reconstruction and selection algorithms have been improved, boosting sensitivity and reducing the background contamination. An updated measurement of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ branching ratio is presented and prospects for the full 2016–2026 dataset are discussed.
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