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

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 density 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.

A Sub-GeV Low Mass Hidden Dark Sector of $SU(2)_H \times U(1)_X$

“…Considering that the mass of the Higgs, m h 1 , has already been measured [59], we are left with a total of 8 free parameters plus the masses for 12 heavy hidden fermions. The effects of heavy hidden fermions in complex scalar dark matter phenomenology in G2HDM was analyzed in [60].…”