Observation of the K+ → π+ ν(ν)over-bar decay and measurement of its branching ratio

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10509853" target="_blank" >RIV/00216208:11320/25:10509853 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=0B82q9Kq1" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=0B82q9Kq1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP02(2025)191" target="_blank" >10.1007/JHEP02(2025)191</a>

Result language
angličtina
Original language name
Observation of the K+ → π+ ν(ν)over-bar decay and measurement of its branching ratio
Original language description
A measurement of the K+ -> pi(+)nu(nu) over bar decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, after modifications to the beamline and detectors, at a higher instantaneous beam intensity with respect to the 2016-2018 data taking. Combining NA62 data collected in 2016-2022, a measurement of B(K+ -> pi(+) nu(nu) over bar) = (13.0(-3.0)(+3.3)) x10(-11) is reported. With 51 signal candidates observed and an expected background of 18(-2)(+3) events, B(K+ -> pi(+) nu(nu) over bar) becomes the smallest branching ratio measured with a signal significance above 5 sigma.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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