Sterile neutrino portal to Dark Matter II: exact dark symmetry
Sterile neutrino portal to Dark Matter II: exact dark symmetry
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DOI：
10.1140/epjc/s10052-017-4963-x
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发表时间：
2016-07
期刊：
影响因子：
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通讯作者：
M. Escudero;N. Rius;V. Sanz
中科院分区：
文献类型：
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作者：
M. Escudero;N. Rius;V. Sanz
我们分析了标准模型 (SM) 的简单扩展，其中暗区由标量和费米子组成，两者都是 SM 规范组下的单线态，但在暗区对称组下带电。惰性中微子在这两个组中都是单线态，介导暗区和 SM 粒子之间的相互作用，并通过跷跷板机制为活跃中微子产生质量。我们探索了参数空间区域，其中观察到的暗物质遗迹丰度是通过湮灭成惰性中微子来确定的，无论是费米子还是标量暗物质粒子。标量暗物质案例为通常的希格斯门户场景提供了一个有趣的替代方案。我们还研究了直接暗物质搜索的限制以及通过惰性中微子衰变成轻子进行间接探测的前景，这可能能够排除质量低于或大约 100 GeV 的暗物质。
We analyze a simple extension of the standard model (SM) with a dark sector composed of a scalar and a fermion, both singlets under the SM gauge group but charged under a dark sector symmetry group. Sterile neutrinos, which are singlets under both groups, mediate the interactions between the dark sector and the SM particles, and generate masses for the active neutrinos via the seesaw mechanism. We explore the parameter space region where the observed Dark Matter relic abundance is determined by the annihilation into sterile neutrinos, both for fermion and scalar Dark Matter particles. The scalar Dark Matter case provides an interesting alternative to the usual Higgs portal scenario. We also study the constraints from direct Dark Matter searches and the prospects for indirect detection via sterile neutrino decays to leptons, which may be able to rule out Dark Matter masses below and around 100 GeV.