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arXiv 1402.6815hep-ph
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小希格斯暗物质和T奇费米子的意义

Implications of the Little Higgs Dark Matter and T-odd Fermions

Chuan-Ren Chen, Ming-Che Lee, Ho-Chin Tsai

摘要:

在发现希格斯玻色子之后,我们在T宇称的最小希格斯模型中研究了暗物质的唯象。我们分析了暗物质的剩余丰度,重点是与T奇费米子的共湮灭效应。在确定了预测WMAP和Planck合作测量的正确遗迹丰度的参数空间之后,我们计算了暗物质与核子之间的弹性散射截面。通过与实验结果的比较,我们发现LUX 2013对低质量暗物质的限制比较温和,而未来的XENON实验有潜力探索T奇轻子和T奇夸克共湮灭的大部分参数空间。我们还研究了在LHC的T-奇费米子对生产的对撞机签名。尽管产生的截面很大,但直接在对撞机上寻找这些T奇费米子是非常具有挑战性的,因为可见的带电轻子或喷流非常柔软。此外,我们表明,与一个额外的硬喷流辐射出的初始状态,T奇夸克对的生产可以显着贡献的单喷流加上丢失的能量搜索在大型强子对撞机。

英文摘要:

We study the phenomenology of dark matter in the Littlest Higgs model with T-parity after the discovery of Higgs boson. We analyze the relic abundance of dark matter, focusing on the effects of coannihilaitons with T-odd fermions. After determining the parameter space that predicts the correct relic abundance measured by WMAP and Planck collaborations, we evaluate the elastic scattering cross section between dark matter and nucleon. In comparison with experimental results, we find that the lower mass of dark matter is constrained mildly by LUX 2013 while the future XENON experiment has potential to explore most of the parameter space for both T-odd lepton and T-odd quark coannihilation scenarios. We also study the collider signatures of T-odd fermion pair production at the LHC. Even though the production cross sections are large, it turns out very challenging to search for these T-odd fermions directly at the collider because the visible charged leptons or jets are very soft. Furthermore, we show that, with an extra hard jet radiated out from the initial state, the T-odd quark pair production can contribute significantly to mono-jet plus missing energy search at the LHC.

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