Complex Scalar Dark Matter in Gauged Two Higgs Doublet Model

Abstract

無中文摘要In this thesis, we study the complex scalar dark matter phenomenology in Gauged Two Higgs Doublet Model (G2HDM). It is shown that a accidental Z 2 symmetry arises naturally from the gauge invariance of SU(2) L ×U(1) Y × SU(2) H ×U(1) X in the model and hence protects the stability of dark matter. The complex scalar dark matter in the model is categorized into inert doublet-like, SU(2) H triplet-like and Goldstone boson-like. While the inert doublet-like dark matter is ruled out by XENON1T data, the SU(2) H triplet-like and Goldstone boson-like dark matter satisfy the relic density from PLANCK and all other experimental constraints from XENON1T, Fermi-LAT and LHC. We discuss in detail the constraints on the parameter space coming from the four pillars of dark matter phenomenology – relic density, direct and indirect detection, and collider searches.