New physics effects on the $W$-boson mass from a doublet extension of the SM Higgs sector

TL;DR

This paper investigates how extending the Higgs sector with a second doublet, specifically within the 2HDM framework, can account for the recent anomalous $W$-boson mass measurement by the CDF collaboration, by analyzing electroweak precision data at two-loop level.

Contribution

It provides a detailed two-loop level analysis of the 2HDM's impact on the $W$-boson mass and identifies parameter regions compatible with the new experimental measurement.

Findings

Certain 2HDM parameter regions can explain the CDF $W$-mass anomaly.

Compatibility with other electroweak precision observables is assessed.

The analysis constrains the extended Higgs sector parameters.

Abstract

Recently, the CDF collaboration has reported a new precision measurement of the $W$-boson mass, $M_W$, showing a large deviation from the value predicted by the Standard Model (SM). In this paper, we analyse possible new physics contributions to $M_W$ from extended Higgs sectors. We focus on the Two-Higgs-Doublet Model (2HDM) as a concrete example. Employing predictions for the electroweak precision observables in the 2HDM at the two-loop level and taking into account further theoretical and experimental constraints, we identify parameter regions of the 2HDM in which the prediction for $M_W$ is close to the new CDF value. We assess the compatibility of these regions with precision measurements of the effective weak mixing angle and the total width of the $Z$ boson.