arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.06433hep-ph
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最小左右对称模型中低能CP破坏的轻子生成

Leptogenesis from low-energy CP violation in minimal left-right symmetric model

Xinyi Zhang, Jiang-Hao Yu, Bo-Qiang Ma

摘要:

我们进行了热无味leptogenesis分析的最小的左右对称模型与离散的左右对称确定为广义宇称或电荷共轭。当轻子Yukawa扇区的左右对称性未破缺时,中微子Dirac耦合矩阵完全由中微子质量和混合角决定,使得产生轻子生成所需的CP破坏完全位于低能扇区.在两种轻子不对称性产生方式下,考虑了I型和混合I型$+$ II中微子质量产生机制.数值求解Boltzmann方程后,我们发现轻子混合矩阵中的低能CP相可以成功地产生所观察到的重子不对称性,并且在某些情况下,Dirac CP相可以是CP破坏的唯一来源.最后,我们讨论了低能量CP相位测量,leptogenesis和无中微子双β衰变之间的相互作用。我们表明,在下一代无中微子双β衰变实验中可以探测到成功的leptogenesis的可行模型。

英文摘要:

We perform a thermal unflavored leptogenesis analysis on minimal left-right symmetric models with discrete left-right symmetry identified as generalized parity or charge conjugation. When left-right symmetry is unbroken in the lepton Yukawa sector, the neutrino Dirac coupling matrix is completely determined by neutrino masses and mixing angles, allowing CP violation needed to generate leptogenesis totally resides in the low-energy sector. With two lepton asymmetry generation ways, both type I and mixed type I$+$II neutrino mass generation mechanisms are considered. After solving the Boltzmann equations numerically, we find that the low-energy CP phases in the lepton mixing matrix can successfully produce the observed baryon asymmetry, and in some cases, the Dirac CP phase can be the only source of CP violation. Finally, we discuss the interplay among low-energy CP phase measurements, leptogenesis, and neutrinoless double beta decay. We show that the viable models for successful leptogenesis can be probed in next-generation neutrinoless double-beta decay experiments.

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