Search for Lepton-Flavor Violation in Z-Boson Decays with τ Leptons with the ATLAS Detector.
Phys Rev Lett
; 127(27): 271801, 2021 Dec 31.
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| MEDLINE
| ID: mdl-35061407
ABSTRACT
A search for lepton-flavor-violating Zâeτ and Zâµτ 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 Zââτ decays. The Zââτ branching fractions are constrained in this analysis to B(Zâeτ)<7.0×10^{-6} and B(Zâµτ)<7.2×10^{-6} at 95% confidence level. The combination with the previously published analyses sets the strongest constraints to date B(Zâeτ)<5.0×10^{-6} and B(Zâµτ)<6.5×10^{-6} at 95% confidence level.
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