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Search for lepton flavor-violating decay modes B⁰to K_S⁰τ^pmell^mp~(ell=μ, e) with hadronic B-tagging at Belle and Belle II
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arxiv 2412.16470 v1 pith:Y7RUSYC5 submitted 2024-12-21 hep-ex
Search for lepton flavor-violating decay modes B⁰to K_S⁰τ^pmell^mp~(ell=μ, e) with hadronic B-tagging at Belle and Belle II
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We present the first search for the lepton flavor-violating decay modes $B^0 \rightarrow K_S^0 \tau^\pm \ell^\mp~(\ell=\mu, e)$ using the 711 fb$^{-1}$ and 365 fb$^{-1}$ data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic $B$-tagging technique, and search for the signal decay in the system recoiling against the fully reconstructed $B$ meson. We find no evidence for $B^0 \rightarrow K_S^0 \tau^\pm \ell^\mp$ decays and set 90\% confidence level upper limits on the branching fractions in the range of $[0.8,\,3.6]\times10^{-5}$.
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