AI 中文总结
在宇称对称标准模型扩展框架下，该研究探讨TeV尺度轻子生成机制，得出热产生要求$v_R \gtrsim 6 \times 10^{12}$ GeV、非热产生仅需$v_R \gtrsim 10$ TeV的结论，为相关实验搜索提供理论依据。
AI 中文摘要
我们在一个宇称对称的标准模型扩展框架中研究轻子生成机制，该模型的规范群为$SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_X$，在能标$v_R$处自发破缺为标准模型规范群。我们聚焦于最小希格斯实现方案，该方案无需引入额外对称性即可解决强CP问题。在该框架中，轻子数通过汤川相互作用被破坏，而中微子质量仅在高阶圈图中产生，这一特性使得右手轻中微子衰变中CP破坏的量子修正参数上可以很大。对于右手轻中微子的热产生，我们发现成功的轻子生成要求$v_R \gtrsim 6 \times 10^{12}$ GeV；而非热产生则大幅放宽了这一限制，仅要求$v_R \gtrsim 10$ TeV，该能标对新粒子的对撞机搜索和稀有过程搜索是可及的。
英文摘要
We study leptogenesis via out-of-equilibrium decays of right-handed neutrinos in a parity symmetric extension of the Standard Model with gauge group $SU(3)_c \times SU(2)_L \times SU(2)_R \times U(1)_X$, spontaneously broken to the Standard Model gauge group at a scale $v_R$. We focus on the minimal Higgs realization, in which the strong CP problem is resolved without invoking additional symmetries. In this framework, lepton number is violated through Yukawa interactions, while neutrino masses arise only at higher loop order, a feature that permits the CP-violating quantum corrections to right-handed neutrino decays to be parametrically large. For thermal production of right-handed neutrinos, we find that successful leptogenesis requires $v_R \gtrsim 6\times 10^{12}$ GeV. Non-thermal production, however, relaxes this bound dramatically, requiring only $v_R \gtrsim 10$ TeV, a scale accessible to collider searches for new particles and searches for rare processes.
Comments27 pages, 4 figures
