267 research outputs found
New measurement of the radiative decay Ke3g at the NA62 experiment at CERN
The NA62 experiment at CERN reports new results from the study of the radiative kaon decay K+→π0e+νγ
(Ke3γ
), using a data sample recorded in 2017 and 2018. Preliminary results with the most precise measurement of the Ke3γ
branching ratio, and a T-asymmetry measurement in the Ke3γ
decay, are presented
Search for lepton number and flavour violation in K+ and pi0 decays
The NA62 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2016-2018. This sample provides sensitivities to rare decays with branching ratios as low as 10 −11 . Searches for the lepton number violating K + → π − µ + e+ decay and the lepton flavour violating K + → π + µ − e + and π 0 → µ − e + decays are reported. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level. These results improve by one order of magnitude over previous results for these decay modes
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