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arXiv 0904.3076hep-ph
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具有A4对称性的共振轻子生成和三重最大轻子混合

Resonant leptogenesis and tribimaximal leptonic mixing with A4 symmetry

G. C. Branco, R. Gonzalez Felipe, M. N. Rebelo, H. Serodio

摘要:

我们研究了具有轻子味对称性的I型跷跷板模型中热瘦生的可行性,该模型导致三重最大中微子混合。我们考虑一个有效的理论与A4 × Z3 × Z4对称性,这是自发破缺的规模远远高于电弱规模。在高标度下,轻子Yukawa相互作用导致精确的tribimalmaximum混合,重Majorana中微子质量谱是精确简并的。在这个框架中,一旦这种简并被重整化群效应或A4对称性的软破缺所解除,leptogenesis就变得可行。低能中微子物理的影响进行了讨论。

英文摘要:

We investigate the viability of thermal leptogenesis in type-I seesaw models with leptonic flavour symmetries that lead to tribimaximal neutrino mixing. We consider an effective theory with an A4 x Z3 x Z4 symmetry, which is spontaneously broken at a scale much higher than the electroweak scale. At the high scale, leptonic Yukawa interactions lead to exact tribimaximal mixing and the heavy Majorana neutrino mass spectrum is exactly degenerate. In this framework, leptogenesis becomes viable once this degeneracy is lifted either by renormalization group effects or by a soft breaking of the A4 symmetry. The implications for low-energy neutrino physics are discussed.

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