Guo, J (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
The Galactic center excess is explained in the framework of the Next-to-Minimal Supersymmetric Standard Model with a Z(3) discrete symmetry. We show that a resonant CP-odd Higgs boson with mass twice that of the Dark Matter (DM) candidate is favored. Meanwhile, the DM candidate is required to have relatively large coupling with the Z boson through its Higgsino component in order to obtain correct DM relic density. Its LHC discovery potential via four signatures is discussed in detail. We find that the most sensitive signals are provided by the Higgsino-like chargino and neutralino pair production with their subsequent decays into W bosons, Z bosons, and DM. The majority of the relevant parameter space can be probed at the Large Hadron Collider with a center-of-mass energy of 14 TeV and an integrated luminosity 1000 fb(-1).
Australian Research Council [CE110001004]
; University of Adelaide
; Natural Science Foundation of China [10821504, 11075194, 11135003, 11275246, 11475238]
; National Basic Research Program of China (973 Program) [2010CB833000]