Power-aligned 2HDM: a correlative perspective on $(g-2)_{e,\mu}$

TL;DR

This paper proposes a power-aligned two-Higgs-doublet model that explains both electron and muon magnetic moment anomalies simultaneously, while remaining consistent with current experimental constraints and offering testable predictions.

Contribution

It introduces a novel power-aligned Yukawa coupling relation in 2HDM, enabling a unified explanation of lepton g-2 anomalies with TeV-scale Higgs masses and distinctive testable correlations.

Findings

Simultaneous explanation of electron and muon g-2 anomalies with TeV-scale Higgs masses.

Enhanced charged-lepton Yukawa couplings correlate the anomalies, distinguishing the model from others.

Parameter space remains consistent with B-physics, Z, tau decay data, and LHC bounds.

Abstract

With the hypothesis of minimal flavor violation, we find that there exists a power-aligned relation between the Yukawa couplings of the two scalar doublets in the two-Higgs-doublet model with Hermitian Yukawa matrices. Within such a power-aligned framework, it is found that a simultaneous explanation of the anomalies observed in the electron and muon anomalous magnetic moments can be reached with TeV-scale quasi-degenerate Higgs masses, and the resulting parameter space is also phenomenologically safer under the B-physics, $Z$ and $\tau$ decay data, as well as the current LHC bounds. Furthermore, the flavor-universal power that enhances the charged-lepton Yukawa couplings prompts an interesting correlation between the two anomalies, which makes the model distinguishable from the (generalized) linearly aligned and the lepton-specific two-Higgs-doublet models that address the same anomalies but in a non-correlative manner, and hence testable by future precise measurements.