Search for lepton flavor-violating decay modes B⁰ → K^{∗ 0}τ^±ℓ^∓ (ℓ = e,μ) with hadronic B-tagging at Belle and Belle II

2025/05/13 by Belle, Collaborations, Belle II, : +375 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2505.08418

Abstract

We present the results of a search for the charged-lepton-flavor violating decays B⁰ → K^*0τ^± ℓ^∓, where ℓ^∓ is either an electron or a muon. The results are based on 365 fb^-1 and 711 fb^-1 datasets collected with the Belle II and Belle detectors, respectively. We use an exclusive hadronic B-tagging technique, and search for a signal decay in the system recoiling against a fully reconstructed B meson. We find no evidence for B⁰ → K^*0τ^± ℓ^∓ decays and set upper limits on the branching fractions in the range of (2.9-6.4)×10^-5 at 90% confidence level.

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• Search for the lepton-flavour-violating decays B⁰ → K^*0 τ^± e^∓

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