NA62 measured B(K+ → π+ ν ν-bar) = (9.6 +1.9 -1.8) × 10^-11 from 2016-2024 data, compatible with the SM prediction at better than 20% precision.
Cortina Gilet al[NA62 Collaboration],JINST12(05), P05025 (2017)
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New measurement of $K^+\to\pi^+\nu\bar\nu$ branching ratio at the NA62 experiment
NA62 measured B(K+ → π+ ν ν-bar) = (9.6 +1.9 -1.8) × 10^-11 from 2016-2024 data, compatible with the SM prediction at better than 20% precision.