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

TL;DR

This paper provides a comprehensive two-loop calculation of the 2HDM's contribution to the muon magnetic moment, showing it can explain the current experimental discrepancy within parameter constraints.

Contribution

It presents the complete two-loop bosonic contribution to a_mu in the 2HDM, expressed with physical parameters, and analyzes its potential to account for experimental results.

Findings

Full two-loop bosonic contribution can reach (2 to 4)×10^{-10}

Result can accommodate current experimental muon g-2 value

Parameter dependence is simple and well-documented

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.