Exotic Leptons: Higgs, Flavor and Collider Phenomenology

Understand

We study extensions of the standard model by one generation of vector-like leptons with non-standard hypercharges, which allow for a sizable modification of the h -> gamma gamma decay rate for new lepton masses in the 300 GeV - 1 TeV range.

• We analyze vaccum stability implications for different hypercharges.
• Effects in h -> Z gamma are typically much smaller than in h -> gamma gamma, but distinct among the considered hypercharge assignments.
• Non-standard hypercharges constrain or entirely forbid possible mixing operators with standard model leptons.