Impact of electroweak group representation in models for $B$ and $g-2$ anomalies from Dark Loops

TL;DR

This paper compares two models explaining lepton flavor violation, dark matter, and muon g-2 anomalies via one-loop diagrams involving dark sector particles, highlighting differences in dark matter mass constraints.

Contribution

It introduces and compares two specific models with different electroweak representations that simultaneously address multiple anomalies and constraints.

Findings

Both models can explain the anomalies and satisfy flavor and dark matter constraints.

Differences in dark matter mass ranges are due to how dark matter constraints influence each model.

Models are consistent with current experimental bounds.

Abstract

We discuss two models which are part of a class providing a common explanation for lepton flavor universality violation in $b \to s l^+ l^- $ decays, the dark matter (DM) problem and the muon $(g-2)$ anomaly. The $B$ meson decays and the muon $(g-2)$ anomalies are explained by additional one-loop diagrams with DM candidates. The models have one extra fermion field and two extra scalar fields relative to the Standard Model (SM). The $SU(3)$ quantum numbers are fixed by the interaction with the SM fermions in a new Yukawa Lagrangian that connects the dark and the visible sectors. We compare two models, one where the fermion is a singlet and the scalars are doublets under $SU(2)_L$ and another one where the fermion is a doublet and the scalars are singlets under $SU(2)_L$. We conclude that both models can explain all new physics phenomena simultaneously, while satisfying all other flavor and DM constraints. However, there are crucial differences between how the DM constraints affect the two models leading to a noticeable difference in the allowed DM mass range.