Search for lepton flavor-violating decay modes $B^0 \to K_S^0\tau^\pm\ell^\mp (\ell=\mu,e)$ with hadronic $B$-tagging at Belle and Belle II
Category: Physics / performance paper
Tags:
| Principal Authors | Meihong Liu, Tao Luo, Karim Trabelsi |
|---|---|
| Date | 2026-03-31 |
| Working group | Radiative and Electroweak Penguin |
| Belle II Number | BELLE2-PUB-PH-2026-018 |
| Abstract | We present the first search for the lepton flavor-violating decay modes $B^0 \rightarrow K_S^0 \tau^\pm \ell^\mp~(\ell=\mu, e)$ 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 $B^0 \rightarrow K_S^0 \tau^\pm \ell^\mp$ decays and set 90% confidence level upper limits on the branching fractions in the range of $[0.8,\,3.6]\times10^{-5}$. |
| ArXiv | https://arxiv.org/abs/2412.16470 |
| Inspire | https://inspirehep.net/literature/2862267 |
| DOI | 10.1103/yzvh-v3hm |
| Reference | Phys.Rev.Lett. 135, 041801 (2025) |
| Bibtex | @article{Belle:2024kur,
author = "Adachi, Ichiro and others",
collaboration = "Belle, Belle-II",
title = "{Search for Lepton-Flavor-Violating Decay Modes B0{\textrightarrow}KS0{\ensuremath{\tau}}{\ensuremath{\pm}}{\ensuremath{\ell}}{\ensuremath{\mp}} with Hadronic B Tagging at Belle and Belle~II}",
eprint = "2412.16470",
archivePrefix = "arXiv",
primaryClass = "hep-ex",
reportNumber = "Belle II Preprint 2024-031, KEK Preprint 2024-33",
doi = "10.1103/yzvh-v3hm",
journal = "Phys. Rev. Lett.",
volume = "135",
number = "4",
pages = "041801",
year = "2025"
}
|
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