Constraints on the $K_{\mathrm{S}}^0\to {\mu }^{+}{\mu }^{-}$ branching fraction

Abstract

A search for the decay $K_{\mathrm{S}}^0\to {\mu }^{+}{\mu }^{-}$ is performed using proton-proton collision data, corresponding to an integrated luminosity of $5.6{\text{fb}}^{-1}$ and collected with the LHCb experiment during 2016, 2017 and 2018 at a center-of-mass energy of $13\mathrm{TeV}$. The observed signal yield is consistent with zero, yielding an upper limit of $\mathcal{B}(K_{\mathrm{S}}^0\to {\mu }^{+}{\mu }^{-})<2.2\times 10^{-10}$ at 90% CL. The limit reduces to $\mathcal{B}(K_{\mathrm{S}}^0\to {\mu }^{+}{\mu }^{-})<2.1\times 10^{-10}$ at 90% CL once combined with the result from data taken in 2011 and 2012.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-038.html

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• Workshop summary -- Kaons@CERN 2023
• Explaining the $b\to s{\ell }^{+}{\ell }^{-}$ anomalies in $Z^{\prime }$ scenarios with top-FCNC couplings
• ${\Sigma }^{+}\to p{\ell }^{+}{\ell }^{-}$ decays within the standard model and beyond
• Kaon physics overview
• Observation of the very rare ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$ decay
• New Physics Searches at Kaon and Hyperon Factories
• Search for $K_{\mathrm{S}(\mathrm{L})}^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ decays at LHCb