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Monochromatic gamma-ray lines are thought to be the smoking gun signal of theannihilation or decay of dark matter since they do not suffer from deflectionor absorption on galactic scales. A recent claim on strong evidence for twogamma-ray lines from the inner galaxy suggests that two-body final states mightbe one photon plus a Z boson or one photon plus a Higgs boson. In this study,we investigate which final state is more possible by analyzing the energyresolution of the Fermi-LAT. It is concluded that the former case, i.e. onephoton plus a Z boson is more plausible than the latter one, i.e. one photonand a Higgs boson since in the latter case the mass of dark matter particleshows tension with a constraint coming from the energy resolution of theFermi-LAT.

Remarks on Two Gamma Ray Lines from the Inner Galaxy