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arXiv 1609.04236hep-ph
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活动中微子的主要Dirac性质的轻子数破坏

Observable Lepton Number Violation with Predominantly Dirac Nature of Active Neutrinos

Debasish Borah, Arnab Dasgupta

备注：
33 pages, 16 figures, to appear in JHEP
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摘要：

我们研究了一个特定版本的$SU(2)_R \times SU(2)_L \times U(1)_{B-L}$模型扩展的离散对称性，其中新的物理部门负责微小的中微子质量在领先的顺序仍然解耦的新的物理部门，可以引起可观察到的签名轻子数违反，如中微子双β衰变。更具体地说，轻中微子质量的主要贡献来自单圈狄拉克质量。在更高的圈级，一个微小的马约拉纳质量也出现了，与狄拉克质量相比，它仍然被抑制了许多数量级。这样一个模型，其中活跃的中微子主要是狄拉克类型，也预测可观察到的带电轻子味违反像$μ\rightarrow 3e, μ\rightarrow e γ$和多组分暗物质。

英文摘要：

We study a specific version of $SU(2)_R \times SU(2)_L \times U(1)_{B-L}$ models extended by discrete symmetries where the new physics sector responsible for tiny neutrino masses at leading order remains decoupled from the new physics sector that can give rise to observable signatures of lepton number violation such as neutrinoless double beta decay. More specifically, the dominant contribution to light neutrino masses comes from a one-loop Dirac mass. At higher loop level, a tiny Majorana mass also appears which remains suppressed by many order of magnitudes in comparison to the Dirac mass. Such a model where the active neutrinos are predominantly of Dirac type, also predicts observable charged lepton flavour violation like $μ\rightarrow 3e, μ\rightarrow e γ$ and multi-component dark matter.

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