We present a search for the charged lepton-flavor-violating decays ϒ(1S) →ℓ±ℓ′ and radiative charged lepton-flavour-violating decays ϒ(1S) → γℓ±ℓ′ [ℓ,ℓ′ = e, μ, τ] using the 158 million ϒ(2S) sample collected by the Belle detector at the KEKB collider. This search uses ϒ(1S) mesons produced in ϒ(2S) → π+π ϒ(1S) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level. [Figure not available: see fulltext.]

Original languageEnglish
Article number95
JournalJournal of High Energy Physics
Issue number5
Publication statusPublished - 2022 May


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