Jan 10 – 14, 2022
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Measurement of the very rare K+ to pi+ nu nubar decay

Jan 11, 2022, 5:50 PM
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Parallel session talk Flavour Quark and charged lepton flavour


Monica Pepe (INFN Perugia (IT))


The decay K+→π+ νν ̅, with a very precisely predicted branching ratio of less than 10-10, is among the best processes to reveal indirect effects of new physics.
The NA62 experiment at CERN SPS is designed to study the K+→π+ νν ̅ decay and to measure its branching ratio using a decay-in-flight technique. NA62 took data in 2016, 2017 and 2018, reaching the sensitivity of the Standard Model for the K+→π+ νν ̅ decay by the analysis of the 2016 and 2017 data, and providing the most precise measurement of the branching ratio to date by the analysis of the 2018 data. This measurement is also used to set limits on BR(K+→π+X), where X is
a scalar or pseudo-scalar particle.
The final result of the K+→π+ νν ̅ branching ratio measurement and its interpretation in terms of K+→π+ X decay from the analysis of the full 2016-2017-2018 data set is presented, and future plans and prospects reviewed.

Primary author

Patrizia Cenci (INFN Perugia (IT))

Presentation materials