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

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Article number271802
<mark>Journal publication date</mark>28/12/2021
<mark>Journal</mark>Physical review letters
Issue number27
Volume127
Number of pages20
Publication StatusPublished
<mark>Original language</mark>English

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)