ATLAS Collaboration (Including: Becker, K., Facini, Gabriel, Harrison, P. F., Jones, Eleanor, Martin, T. A., Morgenstern, S., Murray, W. J., Roberts, B. A., Spangenberg, Martin and Vladimirov, V. E.). (2021) Search for lepton-flavor violation in Z-boson decays with τ leptons with the ATLAS detector. Physical Review Letters, 127 (27). 271801. doi:10.1103/PhysRevLett.127.271801 ISSN 0031-9007.

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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 √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:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Z bosons -- Decay, Leptons (Nuclear physics), Quantum flavor dynamics, Hadrons -- Scattering, Particles (Nuclear physics) -- Flavor
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	28 December 2021
Dates:	Date Event 28 December 2021 Published 5 October 2021 Accepted
Volume:	127
Number:	27
Article Number:	271801
DOI:	10.1103/PhysRevLett.127.271801
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	24 February 2022
Date of first compliant Open Access:	24 February 2022
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Contributors:	Contribution Name Contributor ID Research Group The ATLAS Collaboration, UNSPECIFIED

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