Higgs Vacuum Stability with Vector-like Fermions

Understand

We present the effects of vector-like fermions (VLF) on the stability of the Higgs electroweak vacuum, using the renormalization group improved Higgs effective potential.

• We review the calculation of the one-loop beta-functions of the standard model couplings, paying particular attention to the fermion contributions.
• From this, we derive the VLF contributions to the beta-functions.
• We also include the significant two-loop contributions to the beta-functions.