Search for Lepton-Flavor-Violating tau Decays into a Lepton and an f0(980) Meson

Abstract

We search for lepton-flavor-violating tau decays into a lepton (electron or muon) and an f0(980) meson using 671 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. No events are observed and we set the following 90% C.L. upper limits on the branching fraction products: B(tau- -> e-f0(980))*B(f0(980)->pi+pi-)<3.2x10^-8 and B(tau- -> mu-f0(980))*B(f0(980) -> pi+pi-)<3.4x10^-8. This is the first search performed for these modes.

10 pages, 4 figures, submitted to Phys. Lett. B

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• Improving the Hadron Physics of Non-Standard-Model Decays: Example Bounds on R-parity Violation
• Searches for Lepton Flavor Violation in Tau Decays at Belle II
• Snowmass 2021 White Paper: Charged lepton flavor violation in the tau sector
• Disentangling new physics contributions in lepton flavour violating tau decays
• Lepton flavor violation beyond the MSSM
• Hadronic and radiative decays of the tau lepton