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arXiv 2407.02701hep-ph
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现实翻转SU(5)模型中的轻子生成

Leptogenesis in Realistic Flipped SU(5)

Stephen F. King, George K. Leontaris, Luca Marsili, Ye-Ling Zhou

AI总结:

本文在现实翻转SU(5)统一模型中提出由两个质量接近的右手中微子非共振产生热轻子生成的新方案,解决了传统质量层级过强导致轻子不对称被冲刷的问题,并预言最轻左手中微子质量小于10^-7 eV。

摘要:

我们研究了现实超对称翻转 $SU(5)\ imes U(1)$ 统一理论中的热轻子生成。由于上型夸克和中微子被安排在相同的多重态中,它们表现出强烈的关联性,并且人们普遍认为右手中微子的质量层级过于明显,难以拟合低能中微子数据。这种模式通常预言最轻的右手中微子太轻而无法实现成功的轻子生成,并且除非假设特殊的味结构,否则由较重中微子产生的任何轻子-反轻子不对称性都会被冲刷掉。我们提出了一种不同的方案,其中最轻的两个右手中微子 $N_1$ 和 $N_2$ 具有接近的质量,量级为 $10^9$ GeV,热轻子生成非共振地由 $N_1$ 和 $N_2$ 共同产生。我们证明了这种模式与所有费米子质量和混合数据一致,并预言最轻的物理左手征中微子质量小于约 $10^{-7}$ eV。不取最大CP破坏值的狄拉克相位在轻子生成中起着重要作用。

英文摘要:

We study thermal leptogenesis in realistic supersymmetric flipped $SU(5)\times U(1)$ unification. As up-type quarks and neutrinos are arranged in the same multiplets, they exhibit strong correlations, and it is commonly believed that the masses of right-handed (RH) neutrinos are too hierarchical to fit the low-energy neutrino data. This pattern generally predicts a lightest RH neutrino too light to yield successful leptogenesis, with any lepton-antilepton asymmetry generated from heavier neutrinos being washed out unless special flavour structures are assumed. We propose a different scenario in which the lightest two RH neutrinos $N_1$ and $N_2$ have nearby masses of order $10^9$ GeV, with thermal leptogenesis arising non-resonantly from both $N_1$ and $N_2$. We show that this pattern is consistent with all data on fermion masses and mixing and predicts the lightest physical left-handed neutrino mass to be smaller than about $10^{-7}$~eV. The Dirac phase, which does not take the maximal CP-violating value, plays an important role in leptogenesis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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