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arXiv 1903.01477hep-phastro-ph.CO
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剩余对称性在暗物质稳定性和中微子性质中的作用

The role of residual symmetries in dark matter stability and the neutrino nature

Cesar Bonilla, Eduardo Peinado, Rahul Srivastava

摘要:

我们考虑一类模型,其中狄拉克中微子质量在一个循环和暗物质的稳定性,可以得到只使用全球$U(1)_{B-L}$对称性已经存在于标准模型。我们讨论了如何剩余的$\mathcal{Z}_n$子群,左不间断的$U(1)_{B-L}$打破后,支配中微子的性质,即如果他们是狄拉克或马约拉纳粒子,以及确定在这样的模型中的暗物质候选人的稳定性。特别是,我们表明,没有正确的$U(1)_{B-L}$打破一个适当的剩余$\mathcal{Z}_n$对称性,狄拉克性质的中微子和/或暗物质稳定性可能会丢失。为了完整起见,我们还提供了一些暗物质稳定性是偶然的或完全丧失的例子。最后,我们讨论了一个例子模型中的狄拉克中微子与自然小的一圈质量以及暗物质的稳定性,都是由相同的剩余$\mathcal{Z}_6$子群,而不需要添加任何新的明确的或意外的对称性以外的标准模型对称性的保护。

英文摘要:

We consider the class of models where Dirac neutrino masses at one loop and the dark matter stability can be obtained using only the global $U(1)_{B-L}$ symmetry already present in Standard Model. We discuss how the residual $\mathcal{Z}_n$ subgroup, left unbroken after the breaking of $U(1)_{B-L}$, dictates the neutrino nature, namely if they are Dirac or Majorana particles, as well as determines the stability of the dark matter candidate in such models. In particular, we show that without the correct breaking of $U(1)_{B-L}$ to an appropriate residual $\mathcal{Z}_n$ symmetry, the Dirac nature of neutrinos and/or dark matter stability might be lost. For completeness we also provide some examples where the dark matter stability is accidental or lost completely. Finally, we discuss one example model where the Dirac neutrinos with naturally small one loop masses as well as dark matter stability, are both protected by the same residual $\mathcal{Z}_6$ subgroup, without need for adding any new explicit or accidental symmetries beyond the Standard Model symmetries.

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