Constraints from new CDF II W-boson mass on top–bottom seesaw and the topflavor models

Abstract

In top–bottom seesaw and topflavor model, there may exist extra Higgs bosons and vector-like fermions, and we have examined the W-mass anomaly reported by CDF II in these frames. We found that the CDF II W-boson mass data constrains the parameter [Formula: see text] and [Formula: see text] strictly in the two models, respectively, while the constraints on other parameters such as [Formula: see text], [Formula: see text] are quite weak. Therefore, we conclude that in the two models, the W-mass increment is sensitive to the extra fermions, but not the extra scalars. In topFlavor model, we also consider the W-mass increment induced by the mass mixing of the light and the heavy gauge bosons and the contribution is not too large and the constraints on the parameters [Formula: see text] and [Formula: see text] are weak.