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Improved limit on the branching fraction of the rare decay K⁰_(scriptscriptstyle S)toμ^+μ^-
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arxiv 1706.00758 v3 pith:ZG3HBLYM submitted 2017-06-02 hep-ex
Improved limit on the branching fraction of the rare decay K⁰_(scriptscriptstyle S)toμ^+μ^-
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A search for the decay $K^0_{\scriptscriptstyle S}\to\mu^+\mu^-$ 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 ${\cal B}(K^0_{\scriptscriptstyle S}\to\mu^+\mu^-) < 0.8~(1.0) \times 10^{-9}$ at $90\%~(95\%)$ confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitude.
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