ATTENTION: We have to do a short maintenance with downtime on Wed 19 Oct 2022, 9:00 - 10:00 CEST. Please finish your work in time to prevent data loss.
Jul 26 – 30, 2021
Europe/Berlin timezone

Measurement of the very rare K^+→π^+ νν ̅ decay with the NA62 Experiment at CERN

Jul 28, 2021, 10:30 AM


Parallel session talk Flavour Physics and CP Violation T08: Flavour Physics and CP Violation


Angela Romano (University of Birmingham)


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 K^+→π^+ νν ̅ 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 the branching ratio of a possible K^+→π^+ X decay, 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.

First author The NA62 Collaboration at CERN

Primary author

Angela Romano (University of Birmingham)

Presentation materials