A search for lepton-flavor-violating decays of the ℤ boson into a τ-lepton and a light lepton with the ATLAS detector

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). A search for lepton-flavor-violating decays of the ℤ boson into a τ-lepton and a light lepton with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, 98(9) American Physical Society 10.1103/PhysRevD.98.092010

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Direct searches for lepton flavor violation in decays of the Z boson with the ATLAS detector at the LHC are presented. Decays of the Z boson into an electron or muon and a hadronically decaying τ lepton are considered. The searches are based on a data sample of proton-proton collisions collected by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1fb⁻¹ at a center-of-mass energy of √s = 13 TeV. No statistically significant excess of events above the expected background is observed, and upper limits on the branching ratios of lepton-flavor-violating decays are set at the 95% confidence level: B(Z→eτ) < 5.8×10⁻⁵ and B(Z→μτ) < 2.4×10⁻⁵. This is the first limit onB(Z→eτ) with ATLAS data. The upper limit onB(Z→μτ) is combined with a previous ATLAS resultbased on 20.3 fb⁻¹ of proton-proton collision data at a center-of-mass energy of √s = 8TeV and thecombined upper limit at 95% confidence level is B(Z→μτ) <1.3×10⁻⁵.

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