We present the first search for the lepton-flavor-violating decay modes B0→KS0 \tau\pm \ell\mp (\ell=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 \tau decays to either light leptons, one charged hadron, or one charged hadron and a neutral pion. We find no evidence for B0→KS0 \tau\pm \ell\mp 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 B0 → KS0 \tau\pm \ell\mp with Hadronic B Tagging at Belle and Belle II

Dorigo, M.;Gabrielli, A.;Ganiev, E.;Ghosh, D.;Lanceri, L.;Manfredi, R.;Mantovano, M.;Raiz, S.;Vitale, L.;
2025-01-01

Abstract

We present the first search for the lepton-flavor-violating decay modes B0→KS0 \tau\pm \ell\mp (\ell=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 \tau decays to either light leptons, one charged hadron, or one charged hadron and a neutral pion. We find no evidence for B0→KS0 \tau\pm \ell\mp decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8,3.6]×10-5.
2025
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3121559
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