论文标题
左右对称性的自然轻毛和伪dirac中微子
Naturally Light Dirac and Pseudo-Dirac Neutrinos from Left-Right Symmetry
论文作者
论文摘要
我们根据量规组$ su（3）_C \ times su（2）_l \ times su（2）_r \ times u（1）$开发一类左右对称理论，并具有用于生成带电的费米亚质量的通用Seesaw机制。中微子自然是该设置中的狄拉克颗粒，其小质量是由两环量子校正引起的。我们精确地评估了这些两环图，并分析了Lepton部门的风味结构。我们发现与中微子振荡数据相比，与右手量规对称性量表无关。我们还探讨了中微子在该框架中是伪dirac颗粒的可能性，而活跃的和无菌中微子之间的微小质量分裂是由普朗克引起的校正而产生的，并找到了可能的实现。这些模型可以在不久的将来通过CMB中的$ΔN_ {\ rm eff} $进行精确宇宙学测量值进行测试，该模型预计为$ \ simeq 0.14 $。这类模型允许通过平均对称性解决强大的CP问题解决方案，而无需轴承。
We develop a class of left-right symmetric theories based on the gauge group $SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)$ with a generalized seesaw mechanism for generating the charged fermion masses. Neutrinos are naturally Dirac particles in this setup with their small masses arising from two-loop quantum corrections. We evaluate these two-loop diagrams exactly and analyze the flavor structure of the lepton sector. We find excellent fits to neutrino oscillation data, independent of the right-handed gauge symmetry breaking scale. We also explore the possibility that neutrinos are pseudo-Dirac particles in this framework, with the tiny mass splittings between active and sterile neutrinos arising from Planck-induced corrections and find possible realizations. These models can be tested in the near future with precision cosmological measurements of $ΔN_{\rm eff}$ in CMB which is predicted to be $\simeq 0.14$. This class of models allows for a solution to the strong CP problem via parity symmetry without the need for an axion.
