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arXiv 1303.6545hep-ph
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镜像对称性:从活跃和贫瘠中微子质量到重子和暗物质不对称性

Mirror symmetry: from active and sterile neutrino masses to baryonic and dark matter asymmetries

Pei-Hong Gu

摘要:

我们考虑SU(3)_c \times SU(2)_L \times U(1)_Y镜像扇区,其中场内容和无量纲耦合是SU(3)_c \times SU(2)_L \times U(1)_Y普通扇区的拷贝.我们的模型还包含三个具有重Majorana质量的规范单重态费米子和一个具有跷跷板抑制真空期望值的[SU(2)_L \times SU(2 ′_L]-双重态Higgs标量。镜像无菌中微子质量将具有典型的跷跷板形式,而普通的活动中微子质量将具有双重和线性的跷跷板形式。在这种正则和双线跷跷板的情况下,我们可以预期一个eV尺度的无菌中微子和另外两个MeV尺度以上的中微子符合宇宙学和短基线中微子振荡数据。与SU(2)_L和SU(2 ′_L)的sphaleron过程相联系,费米子单态的衰变可以同时在[SU(2)_L]-二重态轻子中产生轻子不对称性,在[SU(2 ′_L]-二重态轻子中产生相等的轻子不对称性,从而解释重子和暗物质的存在.最轻的镜像重子应该有一个确定的质量,大约在5 GeV左右,以解释暗物质的残余密度。U(1)动力学混合可以为暗物质的直接探测打开窗口。

英文摘要:

We consider an SU(3)'_c\times SU(2)'_L\times U(1)'_Y mirror sector where the field content and dimensionless couplings are a copy of the SU(3)_c\times SU(2)_L\times U(1)_Y ordinary sector. Our model also contains three gauge-singlet fermions with heavy Majorana masses and an [SU(2)_L\times SU(2)'_L]-bidoublet Higgs scalar with seesaw-suppressed vacuum expectation value. The mirror sterile neutrino masses will have a form of canonical seesaw while the ordinary active neutrino masses will have a form of double and linear seesaw. In this canonical and double-linear seesaw scenario, we can expect one sterile neutrino at the eV scale and the other two above the MeV scale to fit the cosmological and short baseline neutrino oscillation data. Associated with the SU(2)_L and SU(2)'_L sphaleron processes, the decays of the fermion singlets can simultaneously generate a lepton asymmetry in the [SU(2)_L]-doublet leptons and an equal lepton asymmetry in the [SU(2)'_L]-doublet leptons to explain the existence of baryonic and dark matter. The lightest mirror baryon then should have a determined mass around 5 GeV to account for the dark matter relic density. The U(1) kinetic mixing can open a window for dark matter direct detection.

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