Minimal mirror twin Higgs
Minimal mirror twin Higgs
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DOI：
10.1007/jhep11(2016)172
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发表时间：
2016-09
影响因子：
5.4
通讯作者：
R. Barbieri;L. Hall;K. Harigaya
中科院分区：
文献类型：
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作者：
R. Barbieri;L. Hall;K. Harigaya
在具有最大对称希格斯扇区的镜像孪生世界中，标准模型的小层次结构可以显著减轻，可能会取代LHC覆盖范围以上的截止比例。我们证明了与观测的一致性要求Yukawa耦合中用标准模型与其镜像交换的Z2宇称被打破。这种唯一的Z2破缺的最小有效场论，可以在双希格斯机制所必需的希格斯扇区产生Z2破缺。该理论在希格斯衰变、直接暗物质探测和暗辐射中对信号进行了约束和关联，所有这些都在可预见的实验范围内，在参数空间的电弱标度微调为10-50%的区域内。对于暗物质，既考虑了镜像中子，也考虑了各种自相互作用的镜像原子。讨论了中微子质量信号和由B−L破碎场的真空期望值可能产生的额外Z2破缺的影响。
In a Mirror Twin World with a maximally symmetric Higgs sector the little hierarchy of the Standard Model can be significantly mitigated, perhaps displacing the cutoff scale above the LHC reach. We show that consistency with observations requires that the Z 2 parity exchanging the Standard Model with its mirror be broken in the Yukawa couplings. A minimal such effective field theory, with this sole Z 2 breaking, can generate the Z 2 breaking in the Higgs sector necessary for the Twin Higgs mechanism. The theory has constrained and correlated signals in Higgs decays, direct Dark Matter Detection and Dark Radiation, all within reach of foreseen experiments, over a region of parameter space where the fine-tuning for the electroweak scale is 10-50%. For dark matter, both mirror neutrons and a variety of self-interacting mirror atoms are considered. Neutrino mass signals and the effects of a possible additional Z 2 breaking from the vacuum expectation values of B− L breaking fields are also discussed.