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arXiv 2110.09682hep-ph
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Ib型跷跷板模型中的暗物质简介:一个GeV-scale狄拉克中微子入口

Brief on Dark Matter in the Type Ib Seesaw Model: a GeV-scale Dirac neutrino portal

Bowen Fu

摘要:

Ib型跷跷板作为中微子质量起源的另一种解释,为中微子物理与宇宙学的联系提供了一种新的有趣的途径。在这个过程中,我们考虑一个最小的Ib型跷跷板模型,其中有效中微子质量算符涉及两个不同的希格斯二重态和一个重狄拉克质量。我们提出了一个最小的暗物质扩展模型,其中狄拉克重中微子耦合到一个暗狄拉克费米子和一个暗复杂的标量场,都在离散$Z_2$对称下是奇数,其中较轻的一个作为暗物质的候选人。针对费米子暗物质的情况,我们研究了Yukawa耦合、中微子入口耦合和暗标量与暗费米子质量比的参数空间,其中正确的暗物质残余丰度可以通过冻结机制产生.通过考虑标准模型中微子和重中微子之间的混合,可以在暗物质的产生和实验室实验之间建立联系。

英文摘要:

The type Ib seesaw, as an alternative explanation to the origin of neutrino mass, provides a new intriguing way to connect the neutrino physics to cosmology. In this proceeding, we consider a minimal type Ib seesaw model where the effective neutrino mass operator involves two different Higgs doublets and a heavy Dirac mass. We propose a minimal dark matter extension of this model, in which the Dirac heavy neutrino is coupled to a dark Dirac fermion and a dark complex scalar field, both odd under a discrete $Z_2$ symmetry, where the lighter one serves as a dark matter candidate. Focussing on the fermionic dark matter case, we explore the parameter space of the seesaw Yukawa couplings, the neutrino portal couplings and dark scalar to dark fermion mass ratio, where correct dark matter relic abundance can be produced by the freeze-in mechanism. By considering the mixing between the standard model neutrinos and the heavy neutrino, a connection can be built between dark matter production and laboratory experiments.

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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