Search for lepton-flavour-violating decays of the Higgs and $Z$ bosons with the ATLAS detector

Abstract

Direct searches for lepton flavour violation in decays of the Higgs and $Z$ bosons with the ATLAS detector at the LHC are presented. The following three decays are considered: $H\to e\tau$, $H\to \mu \tau$, and $Z\to \mu \tau$. The searches are based on the data sample of proton--proton collisions collected by the ATLAS detector corresponding to an integrated luminosity of 20.3 fb${}^{-1}$ at a centre-of-mass energy of $\sqrt{s}=8$ TeV. No significant excess is observed, and upper limits on the lepton-flavour-violating branching ratios are set at the 95% confidence level: Br$(H\to e\tau )<$ 1.04%, Br$(H\to \mu \tau )<$ 1.43%, and Br$(Z\to \mu \tau )<$ 1.69 $\times$ 10${}^{-5}$.

28 pages plus cover page plus author list (46 pages total), 6 figures, 9 tables, published in EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2015-09

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