Measurement of the very rare K+ → π+νν¯ decay

The NA62 Collaboration

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)


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 BR(K+ → π+νν¯) measurement and its interpretation in terms of the K+ → π+X decay from the analysis of the full 2016-2018 data set is presented, and future plans and prospects are reviewed.

Original languageEnglish
Title of host publicationProceedings of Science
Publication statusPublished - 2021
Event7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021 - Bergen, Norway
Duration: 29 Nov 20213 Dec 2021

Publication series

NameProceedings of Science
ISSN (Print)1824-8039


Conference7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021

Bibliographical note

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