Status of negative coupling modifiers for extended Higgs sectors

In this work, we study the status of negative coupling modifiers in extended Higgs sectors, focusing on ratio that probes custodial symmetry violation $\lambda_{WZ} = \kappa_{W}/\kappa_{Z}$. sectors with multiplets larger than doublets are only weakly coupled models give tree-level modifications to $\lambda_{WZ}$, and explore all such allowed by constraint from $\rho$ parameter perturbative unitarity. This class has a violating potential, while vacuum configuration preserves symmetry. We apply precision measurements ATLAS CMS show each data set can exclude vast < 0$ at greater 95\% confidence level. evidence $\lambda_{WZ}<0$ is excluded models.