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

Abstract

Recently, the CDF collaboration has reported a new precision measurement of the W-boson mass, MW, showing a large deviation from the value predicted by the Standard Model (SM). In this paper, we analyse possible new physics contributions to MW 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 MW 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.