We present the first search for the lepton-flavor-violating decay modes B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} (ℓ=μ,e) using the 711 and 365  fb^{-1} data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic B-tagging technique to fully reconstruct a B meson and search for signal decays in the system recoiling against the tagged meson, considering τ decays to either light leptons, one charged hadron, or one charged hadron and a neutral pion. We find no evidence for B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8,3.6]×10^{-5}.

Search for Lepton-Flavor-Violating Decay Modes B^{0}→K_{S}^{0}tau^{±}ell^{∓} with Hadronic B Tagging at Belle and Belle II

Bertacchi, V.;Bettarini, S.;Casarosa, G.;Cho, K.;Corona, L.;Forti, F.;Massaccesi, L.;Mondal, S.;Paoloni, E.;Rizzo, G.;Tenchini, F.;Zani, L.;
2025-01-01

Abstract

We present the first search for the lepton-flavor-violating decay modes B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} (ℓ=μ,e) using the 711 and 365  fb^{-1} data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic B-tagging technique to fully reconstruct a B meson and search for signal decays in the system recoiling against the tagged meson, considering τ decays to either light leptons, one charged hadron, or one charged hadron and a neutral pion. We find no evidence for B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8,3.6]×10^{-5}.
2025
Adachi, I.; Adamczyk, K.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Ky, N. Anh; Asner, D.  m.; Atmaca...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1332086
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