arXiv:1001.2869v2 [hep-ph] 20 Apr 2010 Non-zero U$_{e}$$_{3}$ , TeV-Leptogenesis through A$_{4}$ symmetry breaking Y. H. Ahn 1 ∗ ,Chian-Shu Chen 1 , 2 † 1. Institute of Physics, Academia Sinica, Taipei, Taiwan 115, ROC. and 2. National Center for Theoretical Sciences (South), Tainan, Taiwan 701, ROC. Abstract We consider an effective theory with an SU (2) × U (1) × A$_{4}$ × Z$_{2}$ × Z$_{4}$ symmetry and investigate the possibility of a linking TeV-leptogenesis with a reactor angle | U$_{e}$$_{3}$ | through 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$_{e}$$_{3}$ | . Above the scale of Λ the leptonic Yukawa sectors will lead to the exact TBM. We analyze possible spectrums of light neutrinos and their flavor mixing angles corresponding to heavy Majorana neutrino mass ordering, and show that non-resonance leptogenesis at TeV-scale constrained by low energy data is achievable, both analytically as well as numerically. We show that only normal hierarchical spectrum of light neutrino would be strongly favored by the current Wilkinson Microwave Anisotropy Probe (WMAP) data, and also show that a relatively large | U$_{e}$$_{3}$ | corresponds to the value of baryon asymmetry 6 . 2 × 10 − $^{10}$. PACS numbers: 11.30.Hv, 14.60.Pq, 12.60.Fr, 13.35.Hb ∗ E-mail: yhahn@phys.sinica.edu.tw † E-mail: chianshu@phys.sinica. edu.tw 1