Enlarging the window for radiative leptogenesis

被引:56
作者
Branco, GC
Felipe, RG
Joaquim, FR
Nobre, BM
机构
[1] Inst Super Tecn, Dept Fis, Ctr Fis Teor Particulas, P-1049001 Lisbon, Portugal
[2] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy
[3] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
关键词
D O I
10.1016/j.physletb.2005.11.070
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the scenario of resonant thermal leptogenesis, in which the leptonic asymmetries are generated through renormalization group corrections induced at the leptogenesis scale. In the framework of the standard model extended by three heavy Majorana neutrinos with masses M-1 = M-2 << M-3 at some high scale, we show that the mass splitting and CP-violating effects induced by renormalization group corrections can lead to values of the CP asymmetries large enough for a successful leptogenesis. In this scenario, the low-energy neutrino oscillation data can also be easily accommodated. The possibility of having an underlying symmetry behind the degeneracy in the right-handed neutrino mass spectrum is also discussed. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:336 / 344
页数:9
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