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arXiv 1305.3452hep-ph
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单重态费米暗物质与电弱相变

Singlet Fermionic Dark Matter and the Electroweak Phase Transition

Malcolm Fairbairn, Robert Hogan

摘要:

我们考虑一个模型与规范单重狄拉克费米子作为冷暗物质的候选人。暗物质粒子通过耦合到希格斯玻色子的规范单重标量介体与标准模型进行通信。标量介体还用于在标量势中产生树能级势垒,这导致电弱重子生成所需的强烈的一阶电弱相变。我们发现了大量的模型,可以解释所有的暗物质,并提供了一个强大的相变,同时避免了从暗物质直接检测,电弱精密数据,并从大型强子对撞机的最新希格斯数据的约束。下一代的直接探测实验可以排除参数空间的一个大区域,但在希格斯单重态混合非常小时,在某些区域可以避免。

英文摘要:

We consider a model with a gauge singlet Dirac fermion as a cold dark matter candidate. The dark matter particle communicates with the Standard Model via a gauge singlet scalar mediator that couples to the Higgs. The scalar mediator also serves to create a tree-level barrier in the scalar potential which leads to a strongly first order electroweak phase transition as required for Electroweak Baryogenesis. We find a large number of models that can account for all the dark matter and provide a strong phase transition while avoiding constraints from dark matter direct detection, electroweak precision data, and the latest Higgs data from the LHC. The next generation of direct detection experiments could rule out a large region of the parameter space but can be evaded in some regions when the Higgs-singlet mixing is very small.

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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