12:30-13:30
Speaker : Dr. Jongkuk Kim (KIAS, Korea) 

Abstract :
In this talk, I consider scalar/fermion DM models with local dark U(1)_X gauge symmetry that is spontaneously broken into its Z_2 subgroup. 
In this model, dark Higgs boson plays a crucial role in DM phenomenology, not only for generation of dark photon mass, but also opening new channels for DM pair annihilations into the final states involving dark Higgs boson. 
 In the case of XENON1T excess which disappeared recently, lighter dark Higgs plays an important role in the DM relic density calculation.  Also, in the case of U(1)_X =U(1)_{L_\mu-L_\tau} model, dark Higgs boson will dissect the strong correlation M_{Z′} ∼ 2M_{DM}, and much wider mass range is allowed for U(1)_X-charged complex scalar and Dirac fermion DM, still explaining the muon (g − 2).