Search for lepton flavor-violating decay modes $B^0\to K_S^0\tau^\pm\ell^\mp~(\ell=\mu, e)$ with hadronic $B$-tagging at Belle and Belle II

Search for lepton flavor-violating decay modes $B^0\to K_S^0\tau^\pm\ell^\mp~(\ell=\mu, e)$ with hadronic $B$ -tagging at Belle and Belle II

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Dec 20, 2024

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Abstract: (arXiv)

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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