S3 flavor symmetry and leptogenesis

被引：18

作者：

Araki, T. ^{[1
]}

Kubo, J.

Paschos, E. A.

机构：

[1] Kanazawa Univ, Inst Theoret Phys, Kanazawa, Ishikawa 9201192, Japan

[2] Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany

来源：

EUROPEAN PHYSICAL JOURNAL C | 2006年 / 45卷 / 02期

关键词：

D O I：

10.1140/epjc/s2005-02434-3

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We consider leptogenesis in a minimal S-3 extension of the standard model with an additional Z(2) symmetry in the leptonic sector. It is found that the CP phase appearing in the mass matrix of the left-handed neutrinos is the same as that for the CP asymmetries responsible for leptogenesis. Because of the discrete S-3 x Z(2) flavor symmetries, the CP asymmetries are strongly suppressed. To obtain a realistic size of the baryon number asymmetry in the universe, we therefore have to assume that resonant enhancement of the CP asymmetries takes place, and that three degenerate right-handed neutrino masses of O(10) TeV are present.

引用

页码：465 / 475

页数：11

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