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arXiv 1807.02503hep-phhep-ex
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无反常暗物质模型的唯象约束

Phenomenological Constraints on Anomaly-Free Dark Matter Models

John Ellis, Malcolm Fairbairn, Patrick Tunney

摘要:

我们研究了具有额外无反常U(1)“规范玻色子Z”的暗物质的最小基准模型。我们发现模型参数,从而产生正确的宇宙学暗物质密度,同时避免了最新的直接检测搜索暗物质散射产生的氙1 T实验,包括Z-Z'混合的影响。我们还找到了参数空间的区域,逃避约束LHC测量的双轻子和双喷气,精密电弱测量,和LHC搜索单喷流事件与失踪的横向能量。我们研究了两个与夸克和轻子有Y序耦合的基准Z'模型,一个与暗物质粒子有矢量耦合,一个与轴向暗物质耦合。矢量样模型是非常严格的约束,只有一个狭窄的允许带,其中$m_χ\simeq M_{Z'}/2$,轴向模型被排除在研究的参数范围内。我们还考虑了两个疏光Z $^\prime$基准模型,再次发现窄允许带$m_χ\simeq M_{Z'}/2$以及更广泛的地区,其中$\log_{10} (m_χ/ {\rm GeV}) \gtrsim 3.2$。

英文摘要:

We study minimal benchmark models of dark matter with an extra anomaly-free U(1)' gauge boson Z'. We find model parameters that give rise to the correct cosmological dark matter density while evading the latest direct detection searches for dark matter scattering produced by the XENON1T experiment, including the effects of Z-Z' mixing. We also find regions of parameter space that evade the constraints from LHC measurements of dileptons and dijets, precision electroweak measurements, and LHC searches for monojet events with missing transverse energy. We study two benchmark Z' models with Y-sequential couplings to quarks and leptons, one with a vector-like coupling to the dark matter particle and one with an axial dark matter coupling. The vector-like model is extremely tightly constrained, with only a narrow allowed strip where $m_χ\simeq M_{Z'}/2$, and the axial model is excluded within the parameter range studied. We also consider two leptophobic Z$^\prime$ benchmark models, finding again narrow allowed strips where $m_χ\simeq M_{Z'}/2$ as well as more extended regions where $\log_{10} (m_χ/ {\rm GeV}) \gtrsim 3.2$.

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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