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

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

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 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.

Original languageEnglish
Pages (from-to)271801
JournalPhysical review letters
Volume127
Issue number27
DOIs
StatePublished - 31 Dec 2021
Externally publishedYes

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