Singlet Dark Matter in Type II Two Higgs Doublet Model

TL;DR

This paper explores a specific dark matter model involving a light gauge singlet WIMP within the Type II Two Higgs Doublet Model, analyzing its compatibility with experimental data and detection prospects.

Contribution

It introduces a detailed analysis of singlet dark matter candidates in the Type II 2HDM, considering various spins and isospin effects, and compares predictions with experimental constraints.

Findings

Scalar singlet with isospin conservation aligns with direct detection experiments.

Other singlet spins and isospin-violating cases are less compatible with current data.

Parameter space is constrained by LHC data and hadronic uncertainties.

Abstract

Inspired by the dark matter searches in the low mass region, we study the Type II two Higgs doublet model with a light gauge singlet WIMP stabilized by a Z_2 symmetry. The real singlet is required to only couple to the non-Standard Model Higgs. We investigate singlet candidates with different spins as well as isospin violating effect. The parameter space favored by LHC data in two Higgs doublet model and hadronic uncertainties in WIMP-nucleon elastic scattering are also taken into account. We find only the scalar singlet in the isospin conserving case leads to a major overlap with the region of interests of most direct detection experiments.