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arXiv 1209.0376hep-phastro-ph.CO
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130 GeV gamma-ray谱线和Higgs三重态模型中$h\toγγ$的增强加上标量暗物质

130 GeV gamma-ray line and enhancement of $h\toγγ$ in the Higgs triplet model plus a scalar dark matter

Lei Wang, Xiao-Fang Han

摘要:

通过引入离散的$Z_2$对称性,我们在Higgs三重态模型中引入了一个实单重标量$S$,目的是解释Fermi LAT数据中$E_γ$ = 130 GeV处的一个光谱特征的初步证据.该模型能自然地满足暗物质遗迹密度和氙100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增强了$SS\toγγ$的湮没截面,对残余密度的贡献可以忽略不计。对于小的带电标量质量和大于1的耦合常数,$<\sigmav>_{SS\toγγ}$对于$m_{S}=130$ GeV可以达到$\ord(1)\times10^{-27} cm^3 s^{-1}$。此外,该模型还预测了湮没$SS\toγZ$在114 GeV处的第二个光子峰,其截面约为$SS\toγγ$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。

英文摘要:

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 $E_γ$ = 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 $SS\toγγ$ via the one-loop contributions, and give the negligible contributions to the relic density. $<\sigmav>_{SS\toγγ}$ 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 $SS\toγZ$, and the cross section is approximately 0.76 times that of $SS\toγγ$, 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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