Search for charged lepton flavor violating decays of ϒ (1S)

Patra, S and Giri, Anjan Kumar and Sandilya, Saurabh and et al, . (2022) Search for charged lepton flavor violating decays of ϒ (1S). Journal of High Energy Physics, 2022 (5). pp. 1-21. ISSN 1029-8479

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Abstract

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.] © 2022, The Author(s).

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