Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II

A bstract We present the result of a search for the charged-lepton-flavor violating decays τ − → e ∓ ℓ ± ℓ − , where ℓ is a muon or an electron, using a data sample with an integrated luminosity of 428 fb − 1 recorded by the Belle II experiment at the SuperKEKB e + e − collider. The selection of e + e − → τ + τ − events containing a signal candidate is based on an inclusive-tagging reconstruction and on a boosted decision tree to suppress background. Upper limits on the branching fractions between 1.3 and 2.5 × 10 − 8 are set at the 90% confidence level. These results are the most stringent bounds to date for four of the modes.

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Journal
Journal of High Energy Physics
Published
2025-12-22
DOI
https://doi.org/10.1007/jhep12(2025)169
Primary Topic
Particle physics theoretical and experimental studies
Type
article
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0.00

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article

Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II

Debashis Ghosh, Connie Harris, Y. B. Li, Lukas F. Stoetzer et al.
Journal of High Energy Physics
Particle physics theoretical and experimental studies
article

Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II

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article en

Abstract

A bstract We present the result of a search for the charged-lepton-flavor violating decays τ − → e ∓ ℓ ± ℓ − , where ℓ is a muon or an electron, using a data sample with an integrated luminosity of 428 fb − 1 recorded by the Belle II experiment at the SuperKEKB e + e − collider. The selection of e + e − → τ + τ − events containing a signal candidate is based on an inclusive-tagging reconstruction and on a boosted decision tree to suppress background. Upper limits on the branching fractions between 1.3 and 2.5 × 10 − 8 are set at the 90% confidence level. These results are the most stringent bounds to date for four of the modes.

Journal of High Energy PhysicsVol. 2025(12)
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National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, Univerzita Karlova v Praze, Grantová Agentura, Univerzita Karlova, Canarie, University of Tabuk, Vietnam Academy of Science and Technology, Thailand Center of Excellence in Physics, Compute Canada, National Research Foundation of Ukraine, European Commission, National Research Foundation, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Ministry of Education, Culture, Sports, Science and Technology, National Natural Science Foundation of China, Ministerstvo Školství, Mládeže a Tělovýchovy, Grantová Agentura České Republiky, King Saud University, Austrian Science Fund, Generalitat Valenciana, Korea Institute of Science and Technology, Korea Institute of Science and Technology Information, Ikerbasque, Basque Foundation for Science, Knut och Alice Wallenbergs Stiftelse, Max-Planck-Gesellschaft, Javna Agencija za Raziskovalno Dejavnost RS, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Natural Science Foundation of Shandong Province, National Research University Higher School of Economics, Ministry of Education and Science of Ukraine, Ministry of Science and Higher Education of the Russian Federation, Istituto Nazionale di Fisica Nucleare, Bundesministerium für Bildung, Wissenschaft und Forschung, National Science and Technology Council, Korea Research Environment Open Network, Natural Sciences and Engineering Research Council of Canada, Deutsches Elektronen-Synchrotron, Japan Society for the Promotion of Science, Akademi Sains Malaysia, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Institut National de Physique Nucléaire et de Physique des Particules
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Particle physics theoretical and experimental studies
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