New Barr-Zee contributions to $\mathbf{(g-2)_\mu}$ in two-Higgs-doublet models

TL;DR

This paper investigates new two-loop Barr-Zee diagram contributions in two-Higgs-doublet models, showing they can significantly impact the muon's anomalous magnetic moment and potentially explain existing experimental discrepancies.

Contribution

It introduces new Barr-Zee diagram contributions in two-Higgs-doublet models and provides analytical formulas, expanding understanding of muon g-2 within this framework.

Findings

Some contributions are sizeable across parameter space

Contributions can reduce the g-2 discrepancy

Analytical expressions are provided for all calculations

Abstract

We study the contribution of new sets of two-loop Barr-Zee type diagrams to the anomalous magnetic moment of the muon within the two-Higgs-doublet model framework. We show that some of these contributions can be quite sizeable for a large region of the parameter space and can significantly reduce, and in some cases even explain, the discrepancy between the theoretical prediction and the experimentally measured value of this observable. Analytical expressions are given for all the calculations performed in this work.