Global Electroweak Fit Constraints on the Two-Higgs-Doublet Model in Light of the CDF W -Boson Mass

TL;DR

This study examines how the recent CDF W-boson mass measurement impacts the Two-Higgs-Doublet Model, showing that scalar mass splittings can explain the observed shift in electroweak precision data.

Contribution

It provides updated constraints on 2HDM parameters by incorporating the new W-boson mass measurement into global electroweak fits.

Findings

The CDF W-mass measurement can be explained within the 2HDM via scalar mass splittings.

Enhanced contributions to the oblique parameter ΔT accommodate the shift in m_W.

Updated bounds on the scalar spectrum are derived from the global fit.

Abstract

The recent measurement of the $W$ boson mass by the CDF II collaboration exhibits a significant tension with the Standard Model (SM) prediction and other experimental determinations. In this work, we investigate the implications of this result within the framework of the Two-Higgs-Doublet Model (2HDM), focusing on radiative corrections to electroweak precision observables parameterized in terms of the oblique parameters $\Delta S$, $\Delta T$, and $\Delta U$. Using global electroweak fits, we analyze how the inclusion of the CDF measurement modifies the preferred parameter space. We show that the observed shift in $m_W$ can be accommodated in the 2HDM through enhanced contributions to $\Delta T$, arising from mass splittings in the scalar sector. The resulting constraints on the scalar spectrum are presented and compared with those obtained using previous electroweak data. These results highlight the role of precision observables in probing extended Higgs sectors and provide updated bounds on viable 2HDM parameter space.