An updated global fit on the parameter-space of the aligned two-Higgs-doublet model is performed with the help of the open-source package hepfit, assuming the Standard-Model Higgs to be the lightest scalar. No new sources of $CP$ violation, other than the phase in the Cabibbo-Kobayashi-Maskawa matrix of the Standard Model, are considered. A similar global fit was previously performed by O. Eberhardt et al. [Global fits in the aligned two-Higgs-doublet model, J. High Energy Phys. 05 (2021) 005] with a slightly different set of parameters. Our updated fit incorporates improved analyses of the theoretical constraints required for the perturbative unitarity and boundedness of the scalar potential from below, additional flavor observables and updated data on direct searches for heavy scalars at the LHC, Higgs signal strengths, and electroweak precision observables. Although not included in the main fit, the implications of the CDF measurement of the $W^{\pm }$ mass are also discussed.

• Received 18 September 2023
• Accepted 29 December 2023

DOI:https://doi.org/10.1103/PhysRevD.109.035012

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Published by the American Physical Society