Searches for lepton-flavour-violating decays of the Higgs boson in s = 13 ?TeV pp collisions with the ATLAS detector

摘要

This Letter presents direct searches for lepton flavour violation in Higgs boson decays,H→eτandH→μτ, performed with the ATLAS detector at the LHC. The searches are based on a data sample of proton–proton collisions at a centre-of-mass energys=13TeV, corresponding to an integrated luminosity of36.1?fb?1. No significant excess is observed above the expected background from Standard Model processes. The observed (median expected) 95% confidence-level upper limits on the lepton-flavour-violating branching ratios are 0.47% (0.34?0.10+0.13%) and 0.28% (0.37?0.10+0.14%) forH→eτandH→μτ, respectively.