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  1. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
    Free, publicly-accessible full text available June 1, 2024
  2. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review Letters)
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  3. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
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  4. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
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  6. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
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  7. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
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  8. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review Letters)
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  9. ; ; ; ; ; ; ; ; ; ; et al ( , Physical Review D)
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  10. ; ; ; ; ; ; ; ; ; ; et al ( , Journal of High Energy Physics)
    A bstract We present a search for the charged lepton-flavor-violating decays ϒ(1 S ) → ℓ ± ℓ ′ ∓ and radiative charged lepton-flavour-violating decays ϒ(1 S ) → γ ℓ ± ℓ ′ ∓ [ ℓ , ℓ ′ = e, μ, τ ] using the 158 million ϒ(2 S ) sample collected by the Belle detector at the KEKB collider. This search uses ϒ(1 S ) mesons produced in ϒ(2 S ) → π + π − ϒ(1 S ) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level. 
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