CDF $W$ boson mass and muon $g-2$ in type-X two-Higgs-doublet model with a Higgs-phobic light pseudoscalar

Abstract

The recent measurement of the $W$ boson mass by the CDF collaboration adds an anomaly to the long-standing discrepancy in the muon anomalous magnetic moment, $\Delta a_{\mu }$. Although type-X in the two-Higgs-doublet model provides an attractive solution to $\Delta a_{\mu }$ through a light pseudoscalar $A$, the model confronts the exotic Higgs decays of $h\to AA$ and the lepton flavor universality data in the $\tau$ and $Z$ decays. To save the model, we propose that the light pseudoscalar be Higgs-phobic. Through the random scanning over the entire parameter space, we perform a comparative study of the Higgs-phobic type-X with and without the CDF $m_W$ measurement, called the CDF and PDG cases respectively. Both cases can explain the two anomalies as well as all the other constraints but have significant differences in the finally allowed parameter space. For example, a small region with almost degenerate masses of new Higgs bosons around 100 GeV is allowed only in the PDG case. The cutoff scale of the model is also studied via the analysis of renormalization group equations, which reaches up to $10^5\mathrm{GeV}$ ($10^7\mathrm{GeV}$) in the CDF (PDG) case. Since the dominant decay modes are $A\to \tau \tau$, $H\to ZA$, and $H^{\pm }\to W^{\pm }A$ in most of the viable parameter space, we propose the $4\tau +V{V}^{\prime }$ states as the golden discovery channel at the LHC.

Final version to appear in PRD

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