First search for B0 to K_S^0 tau± l∓ shows no signal and sets 90% CL upper limits on branching fractions of (0.8 to 3.6) times 10^-5.
Allwicher et al ., Phys
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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
First search for B0 to K_S^0 tau± l∓ shows no signal and sets 90% CL upper limits on branching fractions of (0.8 to 3.6) times 10^-5.