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arXiv 2006.10263hep-phhep-ex
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具有整体U(1)对称性的惰性双重态模型的唯象

Phenomenology of the Inert Doublet Model with a global U(1) symmetry

Adil Jueid, Jinheung Kim, Soojin Lee, So Young Shim, Jeonghyeon Song

摘要:

惰性双重态模型是一个具有强大理论动机的最小暗物质模型,其中暗物质的稳定性通常通过施加$Z_2$宇称来实现。我们将$Z_2$宇称推广到全局$U(1)$对称性,并研究其唯象意义。该模型有两个特征:CP-偶和CP-奇中性惰性标量$h_1$和$h_2$都成为DM候选;模型参数的数目比$Z_2$宇称模型少一个。我们首先分析了LEP实验,电弱精度测试,理论稳定性,希格斯精度数据,暗物质遗迹密度和直接探测实验的约束。研究发现,如果该模型被要求解释至少10%的观测到的遗迹密度,该理论是非常有限的,暗物质的质量约为$70\;{\rm GeV}$和带电的希格斯玻色子是不是很重。在这个狭窄的参数空间中,我们计算了LHC上几乎所有可能的单$X$和单$XX'$过程的产生截面。单$Wγ$过程被证明有很高的发现潜力的帮助下,中等质量的带电希格斯玻色子衰变成$W^\pm h_{1,2}$。设计搜索策略以增加在HL-LHC和FCC-hh两者处的mono-PDMATHAMT信号的模型的潜在发现。建议对$E_T^{\rm miss}/\sqrt{H_T}$的最佳切割使信号显著性最大化,在HL-LHC处约为$0.76$,在FCC-hh处约为$7.5$。

英文摘要:

The inert doublet model is a minimal dark matter model with strong theoretical motivations, where the stability of dark matter is usually achieved by imposing a $Z_2$ parity. We promote the $Z_2$ parity into a global $U(1)$ symmetry and study its phenomenological implications. There are two characteristic features of the model: both the CP-even and CP-odd neutral inert scalars, $h_1$ and $h_2$, become DM candidates; the number of model parameters is one less than that with $Z_2$ parity. We first analyze the constraints from LEP experiments, electroweak precision tests, theoretical stability, Higgs precision data, dark matter relic density, and direct detection experiments. It is found that if the model is required to explain at least 10% of the observed relic density, the theory is extremely limited such that the dark matter mass is about $70\;{\rm GeV}$ and the charged Higgs boson is not very heavy. Focusing on this narrow parameter space, we calculate the production cross sections of almost all the possible mono-$X$ and mono-$XX'$ processes at the LHC. The mono-$Wγ$ process is shown to have high discovery potential with the help of the decay of the intermediate-mass charged Higgs boson into $W^\pm h_{1,2}$. A search strategy is designed to increase the potential discovery of the model for the mono-$Wγ$ signal at both the HL-LHC and the FCC-hh. The optimal cut on $E_T^{\rm miss}/\sqrt{H_T}$ is suggested to maximize the signal significance, being about $0.76$ at the HL-LHC and about $7.5$ at the FCC-hh.

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