Impact of Vector like quarks on $(g-2)_{\mu}$ with X-II-2HDM scenario and its phenomenological implications

TL;DR

This paper investigates how vector-like quarks within a specific two-Higgs doublet model can explain the muon g-2 anomaly while satisfying experimental constraints, and explores their impact on double Higgs production.

Contribution

It introduces a novel type-XII2HDM with vector-like quarks that can reconcile the muon g-2 anomaly and enhances double Higgs production cross sections.

Findings

Vector-like quarks expand parameter space for muon g-2 explanation.

Model fits muon g-2 anomaly without mixing with SM quarks.

Double Higgs production is significantly enhanced by heavy Higgs and VLQ contributions.

Abstract

The recent observation of the muon $(g-2)_{\mu}$ anomaly continues to challenge the explanations provided by the Standard Model. However, this anomaly can potentially find reconciliation within the framework of two-Higgs doublet models, provided that the pseudoscalar mass remains low. The introduction of additional fermionic components, such as a generation of vector-like quarks, not only broadens the acceptable parameter range for elucidating the anomaly but also presents an opportunity to circumvent conflicts with constraints from B-decays and heavy Higgs searches. We demonstrate the efficacy of fitting the anomaly in the muon magnetic moment within these models, assuming that vector-like quarks do not undergo mixing with Standard Model quarks. With interactions following a type-X pattern for standard model quarks and a type-II pattern for vector-like quarks, results in models designated as type-XII2HDMVLQ. Additionally, we have explored double Higgs production within this model and observed when both the heavy Higgs and VLQ contribute the double Higgs production cross section significantly enhanced.