Lepton flavour violation in the charged lepton sector is an
unambiguous signal of physics beyond the Standard Model. Searches for
lepton flavour violation in decays of the ZZ
boson with the ATLAS detector is reported, focusing on decays into an
electron or muon and a hadronically decaying
\tauτ-lepton,
using pppp
collisions data with a centre-of-mass energy of 13 TeV. Upper limits on
the branching ratios of lepton-flavor-violating decays are set at the
95% confidence level: \mathcal{B}(Z\to e\tau) < 5.8\times10^{-5}ℬ(Z→eτ)<5.8×10−5
and \mathcal{B}(Z\to \mu\tau) < 2.4\times10^{-5}ℬ(Z→μτ)<2.4×10−5.
When combined with a previous ATLAS result based on
pppp
collisions data with a centre-of-mass energy of 8 TeV, an upper limit of
\mathcal{B}(Z\to \mu\tau) < 1.3\times10^{-5}ℬ(Z→μτ)<1.3×10−5
is obtained.
Search for lepton flavour violation in the eμ continuum with the ATLAS detector in $\sqrt{s} = 7~\mbox{TeV}$ pp collisions at the LHC