arXiv 1001.28692010-01hep-ph

非零U_{e3}和TeV-Leptogenesis的A_4对称破缺

Non-zero U_{e3} and TeV-Leptogenesis through A_4 symmetry breaking

Y. H. Ahn, Chian-Shu Chen

备注：: 32 pages, 21 figures, 3 tables. Final version to appear in Phys. Rev. D
发表信息：: Phys.Rev.D81:105013,2010
DOI：: 10.1103/PhysRevD.81.105013

摘要：

我们考虑了一个有效的理论与$SU(2)\times U(1)\times A_{4}\times Z_{2}\times Z_{4}$对称性和调查的可能性连接TeV leptogenesis与反应器的角度$|U_{e3}|$通过自发$A_{4}$对称性破缺，这是在一个规模高于电弱规模下的辐射跷跷板的框架。已经表明，通过锻造$A_{4}$的真空期望值（VEV）对准，可以获得三双峰（TBM）。特别地，在中微子汤川扇区中加入了一个具有截止尺度$Λ$的$A_{4}$三重态标量场，这是导致精确TBM偏离的原因，从而解释了稀薄生成和非零的$|U_{e3}|$ .在$Λ$的尺度之上，轻子汤川扇区将导致精确的TBM。我们分析了轻中微子的可能的光谱和它们的味道混合角对应于重Majorana中微子质量排序，并表明，在TeV尺度的非共振leptogenesis约束下的低能量数据是可以实现的，无论是分析和数值。结果表明，只有正常的轻中微子分级谱才能得到当前Wilkinson微波各向异性探测器（WMAP）数据的强烈支持，同时还表明，相对较大的$|U_{e3}|$对应于重子不对称性值$6.2\times10^{-10}$ .

英文摘要：

We consider an effective theory with an $SU(2)\times U(1)\times A_{4}\times Z_{2}\times Z_{4}$ symmetry and investigate the possibility of a linking TeV-leptogenesis with a reactor angle $|U_{e3}|$ through spontaneous $A_{4}$ symmetry breaking which is at a scale higher than electroweak scale under the framework of radiative seesaw. It has been shown that tri-bimaximal(TBM) can be obtained by forging vacuum expectation value (VEV) alignment of the $A_{4}$. Especially, one $A_{4}$ triplet scalar field with cut-off scale $Λ$ is added in neutrino Yukawa sector, which is responsible for the deviation of the exact TBM, to explain leptogenesis as well as a non-zero $|U_{e3}|$. Above the scale of $Λ$ the leptonic Yukawa sectors will lead to the exact TBM. We analyze possible spectrums of light neutrinos and their flavor mixing angles corresponding to heavy Majorana neutrino mass ordering, and show that non-resonance leptogenesis at TeV-scale constrained by low energy data is achievable, both analytically as well as numerically. We show that only normal hierarchical spectrum of light neutrino would be strongly favored by the current Wilkinson Microwave Anisotropy Probe (WMAP) data, and also show that a relatively large $|U_{e3}|$ corresponds to the value of baryon asymmetry $6.2\times10^{-10}$.

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