Dark matter and flavor anomalies in the light of vector-like fermions and scalar leptoquark

TL;DR

This paper explores a model extending the Standard Model with vector-like fermions and a scalar leptoquark to address dark matter and flavor anomalies, analyzing constraints from various experimental observables and rare decay processes.

Contribution

It introduces a simple extension with vector-like fermions and a scalar leptoquark, providing a comprehensive analysis of dark matter properties and flavor anomalies within this framework.

Findings

Dark matter candidate viability from relic density and detection constraints

Constraints on model parameters from electroweak precision tests

Predictions for rare B meson decay branching ratios

Abstract

We make a comprehensive study of vector-like fermionic dark matter and flavor anomalies in a simple extension of standard model. The model is added with doublet vector-like fermions of quark and lepton types, and also a $S_1(\bar{\textbf{3}},\textbf{1},1/3)$ scalar leptoquark. An additional lepton type singlet fermion is included, whose admixture with vector-like lepton doublet plays the role of dark matter and is examined in relic density and direct detection perspective. Electroweak precision observables are computed to put constraint on model parameter space. We constrain the new couplings from the branching ratios and angular observables associated with $b \to sll (\nu_l \bar \nu_l)$, $b \to s \gamma$ decays and also from the recent measurement on muon anomalous magnetic moment. We then estimate the branching ratios of the rare lepton flavor vioalting $B_{(s)}$ decay modes such as $B_{(s)} \to l_i^\mp l_j^\pm$, $B_{(s)} \to (K^{(*)}, \phi) l_i^\mp l_j^\pm$.