Vector-like leptons: Higgs decays and collider phenomenology

Understand

We study the impact of heavy vector-like leptons on several observables in collider and low-energy physics.

• These states, present in many well-motivated extensions of the Standard Model, can induce lepton flavour violation and non-standard Higgs decays.
• We study these effects in an effective model inspired by the composite Higgs scenario.
• After deriving bounds on the mass and production cross-section of the vector-like states using recent LHC data on multilepton searches, we discuss the modification of the Higgs decays to dilepton, diphoton and $Z\gamma$ final states as well as low-energy observables like radiative lepton decays, the anomalous magnetic moment of the muon and the electric dipole moment of the electron.