Volume 544 - 43rd International Conference on High Energy Physics (ICHEP2026) - Session Quark and Lepton Flavor Physics
A new measurement of the $K^{+} \rightarrow \pi^{+}\nu\bar{\nu}$ branching ratio at the NA62 experiment
J. Swallow
Full text: Not available
Abstract
The $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay is a golden mode for flavour physics.
A new measurement of its branching ratio is presented using results from the analysis of the 2023--2024 dataset.
This dataset doubles the effective sample size, leading to a $5\sigma$ expected sensitivity for the Standard Model process.
Reconstruction and selection algorithms have been improved, boosting sensitivity and reducing the background contamination.
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