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A new report for the measurement of the W boson mass has been provided by theCDF II experiment. The measured value of the W boson mass is given to be$m_W^{\text{CDF II}} = 80.4335 \pm 0.0094$ GeV which shows $7\sigma$ deviationfrom the standard model prediction, while the other groups of high energyexperiments, e.g., ATLAS and D0 II, show consistent results with the latter.Assuming that the measurement at CDF II is correct, we discuss the possibilityto explain the anomaly in the Higgs triplet model. We find that the anomaly canbe explained under the constraints from the electroweak rho parameter, theeffective weak mixing angle, the partial width of the leptonic $Z$ decay andcurrent direct searches at LHC when non-zero mass differences among thetriplet-like Higgs bosons and the vacuum expectation value of the triplet Higgsfield are taken to be ${\cal O}(100)$ GeV and ${\cal O}(1)$ GeV, respectively.

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