Constraints from New CDF II W-Boson Mass On Top-Bottom Seesaw and the TopFlavor Models

TL;DR

This paper investigates how the recent CDF II W-boson mass measurement constrains parameters in top-bottom seesaw and topflavor models, highlighting the sensitivity to extra fermions but not scalars.

Contribution

It provides the first detailed analysis of W mass constraints on these models, especially on parameters r_t and z_t, considering both fermionic and scalar sectors.

Findings

W mass data constrains r_t and z_t parameters.

Constraints on scalar masses m_H and m_χ are weak.

W mass increment mainly sensitive to extra fermions.

Abstract

In top-bottom seesaw and topflavor model, there may exist extra Higgses and vectorlike 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 r_t and z_t strictly in the two models, respectively, while the constraints on other parameters such as m_H, m_\chi 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 x and y are weak.