Type-X two Higgs doublet model in light of the muon $\mathbf{g}-2$: confronting Higgs and collider data

Abstract

The recent Fermilab measurement of the muon anomalous magnetic moment yields $4.2\sigma$ deviations from the SM prediction when combined with the BNL E821 experiment results. In the Type-X two Higgs doublet model, we study the consequence of imposing the observed muon $g-2$, along with the constraints from theoretical stabilities, electroweak oblique parameters, Higgs precision data, and direct searches. For a comprehensive study, we scan the whole parameter space in two scenarios, the normal scenario where $h_{\mathrm{SM}}=h$ and the inverted scenario where $h_{\mathrm{SM}}=H$, where $h$ ($H$) is the light (heavy) CP-even Higgs boson. We found that large $\tan \beta$ (above 100) and light pseudoscalar mass $M_A$ are required to explain the muon $g-2$ anomaly. This breaks the theoretical stability unless the scalar masses satisfy $M_A^2\simeq M_{H^{\pm }}^2\simeq m_{12}^2\tan \beta \approx M_{H/h}^2$. The direct search bounds at the LEP and LHC exclude the light $A$ window with $M_A\lesssim 62.5$GeV. We also show that the observed electron anomalous magnetic moment is consistent with the model prediction, but the lepton flavor universality data in the $\tau$ and $Z$ decays are not. For a separate exploration of the model, we propose the golden mode $pp\to Ah/AH\to 4\tau$ at the HL-LHC.

The final version, including the implication of the LHP Run II data on the results

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