Scale of SU(2)R symmetry breaking and leptogenesis

被引：34

作者：

Ma, E ^{[1
]}

Sarkar, S

Sarkar, U

机构：

[1] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

[2] Univ Oxford, Oxford OX1 3NP, England

[3] Phys Res Lab, Ahmedabad 380009, Gujarat, India

来源：

PHYSICS LETTERS B | 1999年 / 458卷 / 01期

关键词：

D O I：

10.1016/S0370-2693(99)00568-7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Models of leptogenesis often invoke the out-of-equilibrium decays of heavy right-handed neutrinos in order to create a baryon asymmetry of the universe through the electroweak phase transition. Their presumed existence argues strongly for the presence of an SU((2))(R) gauge symmetry. We study the equilibrating effects of the resulting additional right-handed interactions and find that successful leptogenesis requires that m(N) greater than or similar to 10(16) GeV if m(N) > m(WB), and m(WR) greater than or similar to 2 X 10(5) GeV(m(N)/10(2) GeV)(3/4) if m(N) < m(WR), where m(N) is the mass of the lightest right-handed neutrino. A better bound m(WR) greater than or similar to 3 X 10(6) GeV(m(N)/10(2) GeV)(2/3) is obtained if leptogenesis occurs at T > m(WB). We show also that the m(N) > m(WR) option is excluded in a supersymmetric theory with gravitinos. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：73 / 78

页数：6

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