We report a search for the charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays using a 25 fb−1 Υ(2S) sample collected by the Belle detector at the KEKB e+e− asymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions (B) at 90% confidence level. We obtain the most stringent upper limits: B(Υ(2S) → μ∓τ±) < 0.23 × 10−6 and B(Υ(2S) → e∓τ±) < 1.12 × 10−6.
Search for charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle
Tenchini, F.;
2024-01-01
Abstract
We report a search for the charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays using a 25 fb−1 Υ(2S) sample collected by the Belle detector at the KEKB e+e− asymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions (B) at 90% confidence level. We obtain the most stringent upper limits: B(Υ(2S) → μ∓τ±) < 0.23 × 10−6 and B(Υ(2S) → e∓τ±) < 1.12 × 10−6.File in questo prodotto:
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