With a discrete Z _ { 2 } symmetry being imposed , we introduce a real singlet scalar S to the Higgs triplet model with the motivation of explaining the tentative evidence for a line spectral feature at E _ { \gamma } = 130 GeV in the Fermi LAT data .
The model can naturally satisfy the experimental constraints of the dark matter relic density and direct detection data from Xenon100 .
The doubly charged and one charged scalars can enhance the annihilation cross section of SS \to \gamma \gamma via the one-loop contributions , and give the negligible contributions to the relic density . < \sigma v > _ { SS \to \gamma \gamma } for m _ { S } = 130 GeV can reach { \cal O } ( 1 ) \times 10 ^ { -27 } cm ^ { 3 } s ^ { -1 } for the small charged scalars masses and the coupling constant of larger than 1 .
Besides , this model also predict a second photon peak at 114 GeV from the annihilation SS \to \gamma Z , and the cross section is approximately 0.76 times that of SS \to \gamma \gamma , which is below the upper limit reported by Fermi LAT .
Finally , the light charged scalars can enhance LHC diphoton Higgs rate , and make it to be consistent with the experimental data reported by ATLAS and CMS .