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Search for lepton-flavor-violating τ^- to μ^-μ^+μ^- decays at Belle II
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arxiv 2405.07386 v2 pith:6J277HPY submitted 2024-05-12 hep-ex
Search for lepton-flavor-violating τ^- to μ^-μ^+μ^- decays at Belle II
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We present the result of a search for the charged-lepton-flavor violating decay $\tau^- \to \mu^-\mu^+\mu^-$ using a $424fb^{-1}$ sample of data recorded by the Belle II experiment at the SuperKEKB $e^{-}e^{+}$ collider. The selection of $e^{-}e^{+}\to\tau^+\tau^-$ events is based on an inclusive reconstruction of the non-signal tau decay, and on a boosted decision tree to suppress background. We observe one signal candidate, which is compatible with the expectation from background processes. We set a $90\%$ confidence level upper limit of $1.9 \times 10^{-8}$ on the branching fraction of the \taumu decay, which is the most stringent bound to date.
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Cited by 4 Pith papers
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