Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/134749
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Type: Journal article
Title: Search for Lepton-Flavor Violation in Z-Boson Decays with τ Leptons with the ATLAS Detector
Other Titles: Search for Lepton-Flavor Violation in Z-Boson Decays with tau Leptons with the ATLAS Detector
Author: Aad, G.
Abbott, B.
Abbott, D.C.
Abud, A.A.
Abeling, K.
Abhayasinghe, D.K.
Abidi, S.H.
Zeid, O.S.A.
Abraham, N.L.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B.S.
Achkar, B.
Adam, L.
Bourdarios, C.A.
Adamczyk, L.
Adamek, L.
Adelman, J.
Adiguzel, A.
et al.
Citation: Physical Review Letters, 2021; 127(17):271801-1-271801-20
Publisher: American Physical Society
Issue Date: 2021
ISSN: 0031-9007
1079-7114
Statement of
Responsibility: 
G. Aad ... D. Duvnjak ... P. Jackson ... A. X. Y. Kong ... J. L. Oliver ... H. Potti ... T. A. Ruggeri ... K. Sato ... A. S. Sharma ... M. J. White ... et al. (ATLAS Collaboration)
Abstract: 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 ffiffiffi s p ¼ 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 BðZ → eτÞ < 7.0 × 10−6 and BðZ → μτÞ < 7.2 × 10−6 at 95% confidence level. The combination with the previously published analyses sets the strongest constraints to date: BðZ → eτÞ < 5.0 × 10−6 and BðZ → μτÞ < 6.5 × 10−6 at 95% confidence level.
Keywords: ATLAS Collaboration
Description: Published 28 December 2021
Rights: © 2021 CERN, for the ATLAS Collaboration. 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
DOI: 10.1103/PhysRevLett.127.271801
Published version: http://dx.doi.org/10.1103/PhysRevLett.127.271801
Appears in Collections:Physics publications

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