标题： 退化最小对称和轻子生成 显示英文标题

标题： Degenerate minimal see-saw and leptogenesis

摘要： 我们分析了仅包含两个简并的右旋中微子的超对称最小 seesaw 模型的最一般版本，在大统一尺度上它们的质量是简并的。 我们研究了导致这些中微子衰变中非零 CP 不对称性的重整化效应，并发现由于小质量分裂引起的共振增强部分被中微子 Yukawa 耦合运行中的其他 RG 效应所抵消。 尽管有这种抵消，CP 不对称性仍然足够大，可以实现成功的热轻子生成。 此外，它们对右旋中微子质量的依赖非常弱，因此即使在非常低的再加热温度下也可以实现轻子生成，从而克服重粒子问题。 显示英文摘要

摘要： We analyze the most general version of the supersymmetric minimal see-saw model with only two right-chiral neutrinos which are degenerate in masses at the scale of Grand Unification. We study the renormalization effects that give rise to non-zero CP asymmetries in the decays of these neutrinos and find that their resonant enhancement due to small mass splitting is partly compensated by other RG effects in the running of the neutrino Yukawa couplings. In spite of this compensation, the CP asymmetries can be large enough for successful thermal leptogenesis. Moreover, they depend very weakly on the right-chiral neutrino masses and the resulting leptogenesis can be successful for very low reheating temerature, thereby allowing to overcome the gravitino problem.