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

ATLAS Publications, T.M. Carter, A. Hasib, M.P. Heath, S. Palazzo, E.P. Takeva, E.M. Villhauer

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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.
Original languageEnglish
Article number271801
Pages (from-to)1-20
Number of pages20
JournalPhysical Review Letters
Volume127
DOIs
Publication statusPublished - 28 Dec 2022

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