We present the first search for the lepton-flavor-violating decay modes B-0 -> K-S(0)tau(-/+) l(+/-) (l = mu. 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 t 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)tau(-/+) l(+/-) decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8, 3.6] x 10(-5).
Search for Lepton-Flavor-Violating Decay Modes B0 → KS0τ∓ l± with Hadronic B Tagging at Belle and Belle II
Gaz, A;Lin, S;Stroili, R;
2025
Abstract
We present the first search for the lepton-flavor-violating decay modes B-0 -> K-S(0)tau(-/+) l(+/-) (l = mu. 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 t 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)tau(-/+) l(+/-) decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8, 3.6] x 10(-5).
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