Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle, Belle II Collaborations, :, I. Adachi, L. Aggarwal
| Summary:
We present the results of a search for charged-lepton-flavor violating decays
$tau^{-} rightarrow ell^{-}K_{S}^{0}$, where $ell^{-}$ is either an
electron or a muon. We combine $e^+e^-$ data samples recorded by the Belle II
experiment at the SuperKEKB collider (428 fb$^{-1}$) with samples recorded by
the Belle experiment at the KEKB collider (980 fb$^{-1}$) to obtain a sample of
1.3 billion $e^+e^-totau^+tau^-$ events. We observe 0 and 1 events and set
$90%$ confidence level upper limits of $0.8 times 10^{-8}$ and $1.2 times
10^{-8}$ on the branching fractions of the decay modes $tau^{-} rightarrow
e^{-}K_{S}^{0}$ and $tau^{-} rightarrow mu^{-}K_{S}^{0}$, respectively.
These are the most stringent upper limits to date.
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