Effects of New Heavy Fermions on Complex Scalar Dark Matter Phenomenology in Gauged Two Higgs Doublet Model

TL;DR

This paper investigates how introducing heavy fermions affects the behavior and detection prospects of complex scalar dark matter within a specific two Higgs doublet model, emphasizing relic density and direct detection constraints.

Contribution

It analyzes the impact of heavy fermions on dark matter phenomenology in G2HDM, including relic abundance calculations and experimental constraints, with new insights into coannihilation effects.

Findings

Heavy quarks dominate coannihilation processes above 1 TeV.

QCD Sommerfeld correction and bound state effects are negligible.

Current experimental data significantly constrain the model's parameter space.

Abstract

We study the inclusion of new heavy fermions on complex scalar dark matter (DM) phenomenology within gauged two Higgs doublet model (G2HDM). We find that for DM mass above 1 TeV, heavy quarks coannihilations into the Standard Model (SM) quarks and gluons dominate the thermally-averaged cross section relevant for the relic abundance of complex scalar DM. We demonstrate that the effects of QCD Sommerfeld correction as well as QCD bound state formation in determining the DM relic are negligible. We show that the allowed parameter space is significantly constrained by the current PLANCK relic density data as well as XENON1T limit appropriate for DM direct search.