Search for Lepton Flavor Violating tau- Decays into \ell-K0s and \ell-K0sK0s

Abstract

We have searched for the lepton-flavor-violating decays tau- -> ell-K0s and ell-K0sK0s (ell = e or mu), using a data sample of 671 fb^-1 collected with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. No evidence for a signal was found in any of the decay modes, and we set the following upper limits for the branching fractions: B(tau^- -> e^-K0s) < 2.6 x 10^-8, B(tau^- -> μ^-K0s) < 2.3 x 10^-8, B(tau^- -> e^-K0sK0s) < 7.1 x 10^-8 and B(tau^- -> mu^-K0sK0s) < 8.0 x 10^-8 at the 90% confidence level.

12pages, 4 fugures

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• Testing new physics with the electron g-2
• Left-Right SU(4) Vector Leptoquark Model for Flavor Anomalies
• Addressing $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$, muon $g-2$ and ANITA anomalies in a minimal $R$-parity violating supersymmetric framework
• Charged Lepton Flavour Violation in Supersymmetric Low-Scale Seesaw Models
• The third type of fermion mixing in the lepton and quark interactions with leptoquarks
• Gravitational Wave Signatures of Lepton Universality Violation
• Searches for Lepton Flavor Violation in Tau Decays at Belle II
• Snowmass 2021 White Paper: Charged lepton flavor violation in the tau sector