130 GeV gamma-ray line and enhancement of h→γγ in the Higgs triplet model plus a scalar dark matter
130 GeV gamma-ray line and enhancement of h→γγ in the Higgs triplet model plus a scalar dark matter
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DOI：
10.1103/physrevd.87.015015
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发表时间：
2012-09
影响因子：
5
通讯作者：
Lei Wang;Xiao-Fang Han
中科院分区：
文献类型：
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作者：
Lei Wang;Xiao-Fang Han
通过引入一个离散的Z2对称性，我们引入了一个真实的单重标量S来解释费米LAT数据中E\gamma = 130 GeV处的一个谱特征.该模型能自然地满足氙100暗物质遗迹密度和直接探测数据的实验约束。双电荷标量和单电荷标量通过单圈贡献可以增强SS\to\gamma\gamma\$的湮灭截面，而对残余密度的贡献可以忽略不计。当m_{S}=130$ GeV时，$ _{SS\to\gamma\gamma}$可以达到$\ord（1）\times10^{-27} cm^3 s^{-1}$，对于小的带电标量质量和大于1的耦合常数。此外，该模型还预测了114 GeV处的第二光子峰，其湮没截面约为114 GeV处的0.76倍，低于FermiLAT的上限。最后，轻荷电标量能提高LHC双光子Higgs率，并使其与ATLAS和CMS报道的实验数据一致。
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 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. $ _{SS\to\gamma\gamma}$ for $m_{S}=130$ GeV can reach $\ord(1)\times10^{-27} cm^3 s^{-1}$ for the small charged scalar 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.