Search for lepton-flavor-violating τ decays into a lepton and a vector meson using the full Belle data sample

The Belle Collaboration

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Abstract

Charged-lepton-flavor-violation is predicted in several new physics scenarios. We update the analysis of τ lepton decays into a light charged lepton (ℓ = e ± or μ ±) and a vector meson (V 0 = ρ 0, ϕ, ω, K *0, or K¯ *0) using 980 fb−1 of data collected with the Belle detector at the KEKB collider. No significant excess of such signal events is observed, and thus 90% credibility level upper limits are set on the τ → ℓV 0 branching fractions in the range of (1.7–4.3) × 10−8. These limits are improved by 30% on average from the previous results. [Figure not available: see fulltext.].

Original languageEnglish
Article number118
JournalJournal of High Energy Physics
Volume2023
Issue number6
DOIs
StatePublished - Jun 2023

Keywords

  • Tau Physics
  • e-e Experiments

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