Implication of the W boson mass anomaly at CDF II in the Higgs triplet model with a mass difference

A new report for the measurement of the W boson mass has been provided by the CDF II experiment. The measured value of the W boson mass is given to be m(W)(CDF II) = 80.4335 +/- 0.0094 GeV which shows 7 sigma deviation from the standard model prediction, while the other groups of high energy experiments, e.g., ATLAS and DO II, show consistent results with the latter. Assuming that the measurement at CDF II is correct, we discuss the possibility to explain the anomaly in the Higgs triplet model. We find that the anomaly can be explained under the constraints from the electroweak rho parameter, the effective weak mixing angle, the partial width of the leptonic Z decay and current direct searches at LHC when non-zero mass differences among the triplet-like Higgs bosons and the vacuum expectation value of the triplet Higgs field are taken to be O(100) GeV and O(1) GeV, respectively. (C) 2022 The Author(s). Published by Elsevier B.V.

Automated summary

A new report from the CDF II experiment shows a significant deviation in the measured mass of the W boson compared to the standard model prediction. While other high energy experiments have consistent results, the possibility of explaining this anomaly using the Higgs triplet model is discussed.