Search for lepton flavor-violating decay modes B⁰→ K_S⁰τ^±ℓ^∓~(ℓ=μ, e) with hadronic B-tagging at Belle and Belle II

2024/12/21 by Belle, Collaborations, Belle II, : +425
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2412.16470

Abstract

We present the first search for the lepton flavor-violating decay modes B⁰ → K_S⁰ τ^± ℓ^∓~(ℓ=μ, e) using the 711 fb^-1 and 365 fb^-1 data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic B-tagging technique, and search for the signal decay in the system recoiling against the fully reconstructed B meson. We find no evidence for B⁰ → K_S⁰ τ^± ℓ^∓ decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8, 3.6]×10^-5.

Related

• Search for lepton flavor-violating decay modes B⁰ → K^{∗ 0}τ^±ℓ^∓ (ℓ = e,μ) with hadronic B-tagging at Belle and Belle II
• Search for B⁰ → τ^± ℓ^∓ (ℓ=e,μ) with a hadronic tagging method at Belle
• Search for the lepton-flavor-violating τ^- → e^∓ ℓ^± ℓ^∓ decays at Belle II
• Search for lepton-flavor-violating τ^- → ℓ^- K_s⁰ decays at Belle and Belle II
• Search for lepton flavor violating τ→ ℓ V⁰ decays at Belle