Composite dark matter and LHC interplay
Composite dark matter and LHC interplay
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DOI：
10.1007/jhep07(2014)107
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发表时间：
2014-04
影响因子：
5.4
通讯作者：
D. Marzocca;A. Urbano
中科院分区：
文献类型：
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作者：
D. Marzocca;A. Urbano
在标准模型（SM）的自然扩展和暗物质（DM）的性质的背景下，电弱对称性破缺的实际实现是高能粒子物理学中最引人注目的两个问题。复合希格斯模型可能提供一个统一的图景，其中希格斯玻色子和DM粒子在f ~ TeV尺度上作为自发破断全局对称的伪Nambu-Goldstone玻色子出现。本文基于coset SO (6)/SO(5)分析了这类模型的一般类型。假设存在与基本SM粒子线性混合的光和弱耦合自旋-1和自旋-1/2共振，我们可以利用一些广义Weinberg和规则计算该理论的有效势。因此，希格斯玻色子、DM、顶夸克和上述共振的性质是可计算和紧密联系的。我们进行了广泛的现象学分析，考虑了大型强子对撞机物理和天体物理观测。我们发现这些模型受到现有实验数据的严格约束，能够完全排除f≃800 GeV的最自然设置。增大f的值，出现一个允许的区域。特别是对于f≃1。在此基础上，我们找到了一个具体的实现，可以预测DM质量的m→200gev。这个DM候选者接近目前直接检测实验的灵敏度，在不久的将来将被排除或发现。
The actual realization of the electroweak symmetry breaking in the context of a natural extension of the Standard Model (SM) and the nature of Dark Matter (DM) are two of the most compelling questions in high-energy particle physics. Composite Higgs models may provide a unified picture in which both the Higgs boson and the DM particle arise as pseudo Nambu-Goldstone bosons of a spontaneously broken global symmetry at a scale f∼ TeV. In this paper we analyze a general class of these models based on the coset SO (6)/SO (5). Assuming the existence of light and weakly coupled spin-1 and spin-1/2 resonances which mix linearly with the elementary SM particles, we are able to compute the effective potential of the theory by means of some generalized Weinberg sum rules. The properties of the Higgs boson, DM, top quark and the above resonances are thus calculable and tightly connected. We perform a wide phenomenological analysis, considering both collider physics at the LHC and astrophysical observables. We find that these models are tightly constrained by present experimental data, which are able to completely exclude the most natural setup with f≃ 800 GeV. Upon increasing the value of f, an allowed region appears. In particular for f≃ 1. 1 TeV we find a concrete realization that predicts m DM≃ 200 GeV for the DM mass. This DM candidate lies close to the present sensitivity of direct detection experiments and will be ruled out—or discovered—in the near future.