Fermionic dark matter with pseudo-scalar Yukawa interaction
作者： Karim Ghorbani
DOI: 10.1088/1475-7516/2015/01/015
关键词:
摘要: We consider a renormalizable extension of the standard model whose fermionic dark matter (DM) candidate interacts with real singlet pseudo-scalar via Yukawa term while we assume that full Lagrangian is CP-conserved in classical level. When boson develops non-zero vacuum expectation value, spontaneous CP-violation occurs and this provides CP-violated interaction sector SM particles through mixing between Higgs-like SM-like Higgs boson. This scenario suggests minimal number free parameters. Focusing mainly on indirect detection observables, calculate annihilation cross section then compute DM relic density range up to $m_{\text{DM}} = 300$ GeV. find viable regions parameter space constrained by observed abundance as well invisible decay width light 125 GeV discovery at LHC. within region space, there exists mass \sim 38$ annihilating predominantly into $b$ quarks, which can explain Fermi-LAT galactic gamma-ray excess.
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