The muon magnetic moment in the 2HDM: complete two-loop result

Abstract

We study the $\text{2HDM}$ contribution to the muon anomalous magnetic moment $a_{\mu }$ and present the complete two-loop result, particularly for the bosonic contribution. We focus on the Aligned $\text{2HDM}$, which has general Yukawa couplings and contains the type I, II, X, Y models as special cases. The result is expressed with physical parameters: three Higgs boson masses, Yukawa couplings, two mixing angles, and one quartic potential parameter. We show that the result can be split into several parts, each of which has a simple parameter dependence, and we document their general behavior. Taking into account constraints on parameters, we find that the full $\text{2HDM}$ contribution to $a_{\mu }$ can accommodate the current experimental value, and the complete two-loop bosonic contribution can amount to $(2\cdots 4)\times 10^{-10}$, more than the future experimental uncertainty.

Comments: Typos fixed, complying with the published version updated with the erratum. For further details, see included erratum