UC Irvine

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→eτ$$H\rightarrow e\tau $$, H→μτ$$H\rightarrow \mu \tau $$, and Z→μτ$$Z\rightarrow \mu \tau $$. 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$$\mathrm{fb}^{-1}$$ at a centre-of-mass energy of s=8$$\sqrt{s}=8$$ 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→eτ)<1.04%$$(H\rightarrow e\tau )<1.04\%$$, Br(H→μτ)<1.43%$$(H\rightarrow \mu \tau )<1.43\%$$, and Br(Z→μτ)<1.69×10-5$$(Z\rightarrow \mu \tau )<1.69\times 10^{-5}$$.