Search for Lepton-Flavor Violation in Z-Boson Decays with tau Leptons with the ATLAS Detector

Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y
et al (show 2870 more authors) (2021) Search for Lepton-Flavor Violation in Z-Boson Decays with tau Leptons with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 127 (27). 271801-.

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A search for lepton-flavor-violating Z→eτ and Z→μτ decays with pp collision data recorded by the ATLAS detector at the LHC is presented. This analysis uses 139  fb^{-1} of Run 2 pp collisions at sqrt[s]=13  TeV and is combined with the results of a similar ATLAS search in the final state in which the τ lepton decays hadronically, using the same data set as well as Run 1 data. The addition of leptonically decaying τ leptons significantly improves the sensitivity reach for Z→ℓτ decays. The Z→ℓτ branching fractions are constrained in this analysis to B(Z→eτ)<7.0×10^{-6} and B(Z→μτ)<7.2×10^{-6} at 95% confidence level. The combination with the previously published analyses sets the strongest constraints to date: B(Z→eτ)<5.0×10^{-6} and B(Z→μτ)<6.5×10^{-6} at 95% confidence level.

Item Type: Article
Additional Information: 28 pages in total, author list starting page 13, 1 figure, 3 tables, submitted to PRL. All figures including auxiliary figures are available at
Uncontrolled Keywords: ATLAS Collaboration
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 19 Apr 2022 15:32
Last Modified: 18 Jan 2023 21:12
DOI: 10.1103/PhysRevLett.127.271801
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