论文标题
费米银河中心过剩的潜在可检测到的伽马射线线 - 鉴于通过Higgs门户的一步级别的层压（vector）暗物质
A Potentially Detectable Gamma-Ray Line in the Fermi Galactic Center Excess -- In Light of One-Step Cascade Annihilations of Secluded (Vector) Dark Matter via the Higgs Portal
论文作者
论文摘要
鉴于隔离的（矢量）暗物质（DM）模型，我们显示了在费米银河中心过剩中存在可能可检测到的伽马射线线的存在，在该模型中，由于其与标准模型（SM）的相互作用，隐藏的标量几乎与质量中的DM变性，鉴于与标准模型（SM）的相互作用，因此鉴于其与Sm sm sm sm sm higgs的混合在一起。我们发现[60，132] $ gev中的参数区域$ m_x \可以为费米银河中心伽玛射线多余的频谱提供良好的适合，这似乎是一条重要的伽玛射线线，具有[30，66] $ gev的能量$ \。最佳拟合给出$ m_x \ simeq m_s \ simeq 86 $ gev，$ p $ -VALUE $ \，= 0.42 $，因此，由此产生的伽马射线线，由标量介质的衰减到$γγ$中，峰值为43 GEV。我们从费米 - 拉特伽马射线线搜索，费米 - 拉特矮人矮球形星系的伽马射线观察以及普朗克宇宙微波背景测量中得出了对歼灭横截面的约束。对于僻静的向量DM模型，显示了受当前Xenon1T和未来lux-Zeplin约束的参数空间。最后，对于希格斯扇区之间的混合角，我们讨论了其下限，这是大爆炸核合成约束所要求的，并且与隐藏的扇区解耦温度有关。
We show the presence of a potentially detectable gamma-ray line in the Fermi Galactic center excess in light of the secluded (vector) dark matter (DM) model in which the hidden scalar, nearly degenerate with DM in mass, mediates the interaction of the secluded DM with the Standard Model (SM) due to its mixing with the SM Higgs. We find that the parameter region $m_X\in[60, 132]$ GeV can provide a good fit to the Fermi Galactic center gamma-ray excess spectrum, appearing a prominent gamma-ray line with the energy $\in [30, 66]$ GeV. The best fit gives $m_X\simeq m_S \simeq 86$ GeV with a $p$-value$\, =0.42$, so that the resultant gamma-ray line, arising from the decay of the scalar mediator into $γγ$, peaks at 43 GeV. We derive constraints on the annihilation cross section from the Fermi-LAT gamma-ray line search, gamma-ray observations of the Fermi-LAT dwarf spheroidal galaxies, and Planck cosmic microwave background measurement. For the secluded vector DM model, the parameter space constrained by the current XENON1T and future LUX-ZEPLIN is shown. Finally, for the mixing angle between the Higgs sectors, we discuss its lower bound, which is required by the big bang nucleosynthesis constraint and relevant to the hidden sector decoupling temperature.
