Natural Electroweak Symmetry Breaking from Scale Invariant Higgs Mechanism

Understand

We construct a minimal viable extension of the standard model (SM) with classical scale symmetry.

• Its scalar sector contains a complex singlet in addition to the SM Higgs doublet.
• The scale-invariant and CP-symmetric Higgs potential generates radiative electroweak symmetry breaking a la Coleman-Weinberg, and gives a natural solution to the hierarchy problem, free from fine-tuning.
• Besides the 125GeV SM-like Higgs particle, it predicts a new CP-even Higgs (serving as the pseudo-Nambu-Goldstone boson of scale symmetry breaking) and a CP-odd scalar singlet (providing the dark matter candidate) at weak scale.