Search for Lepton-Flavor-Violating 
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 Decays to a Lepton and an Invisible Boson at Belle II

Tau leptons are powerful tools to probe physics beyond the Standard Model (SM). The Belle II experiment is installed at the SuperKEKB asymmetric energy electron-positron collider and aims at collecting the world's largest sample of tau pair events e+e-→τ+ τ-. Direct searches for new invisible mediators, charged lepton flavor violation in τ decays, and tests of the SM via precision measurements of τ lepton properties and couplings are reported in the following article. The results presented here are based on the data collected by Belle II during 2019–2021.

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Lepton flavor violating dark photon

Zhevlakov,

Kirpichnikov,

Lyubovitskij

2024

Phys. Rev. D

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We study the possible impact of dark photons on lepton flavor phenomenology. We derive the constraints on nondiagonal dark photon couplings with leptons by analyzing corresponding contributions to lepton anomalous magnetic moments, rare lepton decays, and the prospects of fixed-target experiments aimed at searching for light dark matter based on missing energy/momentum techniques. Published by the American Physical Society 2024

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Search for Lepton-Flavor-Violating τ Decays to a Lepton and an Invisible Boson at Belle II

Cited by 9 publications

References 32 publications

Leptoquark-induced CLFV decays with a light SM-singlet scalar

Leptoquark-induced CLFV decays with a light SM-singlet scalar

Studies on τ decays at Belle II

Lepton flavor violating dark photon

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