Volume 402 -
The 22nd International Workshop on Neutrinos from Accelerators (NuFact2021) -
All Sessions

Searches for lepton flavour/number violation in $K^{+}$ and $\pi^{0}$ decays at the NA62 experiment

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Published on:
March 31, 2022

Abstract

Searches for the lepton number violating $K^{+}\rightarrow\pi^{-}\mu^{+}e^{+}$ decay and lepton flavour violating decays $K^{+}\rightarrow\pi^{+}\mu^{-}e^{+}$ and $\pi^{0}\rightarrow\mu^{-}e^{+}$ are reported, using NA62 data collected in 2017 and 2018. In the absence of a significant excess above the background in each channel, upper limits on the branching ratios are established at $90\%$ confidence level: $\mathcal{B}(K^{+}\rightarrow\pi^{-}\mu^{+}e^{+})<4.2\times10^{-11}$, $\mathcal{B}(K^{+}\rightarrow\pi^{+}\mu^{-}e^{+})<6.6\times10^{-11}$, and $\mathcal{B}(\pi^{0}\rightarrow\mu^{-}e^{+})<3.2\times10^{-10}$.

DOI: https://doi.org/10.22323/1.402.0130

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