Search for Lepton-Flavor-Violating Decay Modes 𝐵(0) →𝐾(0)(𝑆⁢)𝜏(±)⁢ℓ(∓) with Hadronic 𝐵 Tagging at Belle and Belle II

Date

2025

Authors

Anonymous,

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Journal article

Citation

Physical Review Letters, 2025; 135(4):041801-1-041801-8

Statement of Responsibility

Belle and Belle II Collaborations

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DOI

10.1103/yzvh-v3hm

Abstract

We present the first search for the lepton-flavor-violating decay modes B(0) → K(0)(S)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(0)(S)τ(±)⁢ℓ(∓) decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8; 3.6] × 10⁻⁵.

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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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Grant ID

http://purl.org/au-research/grants/arc/DP200101792
 http://purl.org/au-research/grants/arc/DP210101900
 http://purl.org/au-research/grants/arc/DP210102831
 http://purl.org/au-research/grants/arc/DE220100462
 http://purl.org/au-research/grants/arc/LE210100098
 http://purl.org/au-research/grants/arc/LE230100085

Published Version

https://doi.org/10.1103/yzvh-v3hm

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Persistent link to this record

https://hdl.handle.net/2440/147982