Improved limit on the branching fraction of the rare decay $K_S^0\to {\mu }^{+}{\mu }^{-}$

Abstract

A search for the decay $K_S^0\to {\mu }^{+}{\mu }^{-}$ is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of 3 fb${}^{-1}$, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of $\mathcal{B}(K_S^0\to {\mu }^{+}{\mu }^{-})<0.8(1.0)\times 10^{-9}$ at $90\%(95\%)$ confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitude.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-009.html

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• PYTHIA 6.4 Physics and Manual
• Search for the rare decay KS -> mu+ mu-
• Dispersive treatment of $K_S\to \gamma \gamma$ and $K_S\to \gamma {\ell }^{+}{\ell }^{-}$

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