论文标题
具有全局u（1）对称性的惰性双重模型的现象学
Phenomenology of the Inert Doublet Model with a global U(1) symmetry
论文作者
论文摘要
惰性双重模型是一个最小的暗物质模型，具有强大的理论动机，在这种模型中通常通过施加$ z_2 $均等来实现暗物质的稳定性。我们将$ z_2 $均等的均等范围推广到全球$ u（1）$对称性，并研究其现象学的含义。该模型有两个特征：CP-even和CP-ODD中性惰性标量，$ H_1 $和$ H_2 $，成为DM候选人；模型参数的数量比$ z_2 $奇偶校验少一个。我们首先分析了LEP实验，Electroweak Precision测试，理论稳定性，HIGGS精确数据，暗物质遗物密度和直接检测实验的约束。已经发现，如果要求该模型至少解释观察到的遗物密度的10％，那么该理论非常有限，因此暗物质质量约为70美元\; {\ rm Gev} $，而带电的Higgs Boson并不是很重。为了关注这个狭窄的参数空间，我们计算了LHC上几乎所有可能的单$ x $和单$ xx'$过程的生产横截面。在中间质量的希格斯玻色子的衰减中，单$Wγ$工艺具有很高的发现潜力。搜索策略旨在增加HL-LHC和FCC-HH的单$Wγ$信号模型的潜在发现。建议使用$ e_t^{\ rm MISS}/\ sqrt {h_t} $最大化信号意义，在HL-LHC上约为0.76美元，在FCC-HH上约为7.5美元。
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.
