Speaker
Description
We consider a classically conformal $U(1)$ extension of the Standard Model (SM) in which the new $U(1)$ symmetry is radiatively broken via the Coleman-Weinberg mechanism, after which the $U(1)$ Higgs field $\phi$ drives electroweak symmetry breaking through a mixed quartic coupling with the SM Higgs doublet via coupling constant $\lambda_{mix}$. For $m_{\phi}$ < $\frac{m_{h}}{2}$, the coupling governing the decay $h \rightarrow \phi \phi$ is strongly suppressed, and experimental signals lie in the domain of future experiments such as the ILC. Additional probes of this conformal model are future gravitational wave (GW) observatories, capable of detecting primordial GW generated from a strong first-order phase transition (FOPT). We perform a numerical analysis to investigate possible characteristic GW signals and detection prospects for a conformal model with such a phase transition, specifically for parameter regions which would simultaneously reproduce observed Dark Matter relic density and for which the anomalous Higgs properties can be measured at the ILC.
