English

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

High Energy Physics - Phenomenology 2010-05-25 v2

Abstract

We consider an effective theory with an SU(2)×U(1)×A4×Z2×Z4SU(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 Ue3|U_{e3}| through spontaneous A4A_{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 A4A_{4}. Especially, one A4A_{4} triplet scalar field with cut-off scale Λ\Lambda 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 Ue3|U_{e3}|. Above the scale of Λ\Lambda 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 Ue3|U_{e3}| corresponds to the value of baryon asymmetry 6.2×10106.2\times10^{-10}.

Keywords

Cite

@article{arxiv.1001.2869,
  title  = {Non-zero U_{e3} and TeV-Leptogenesis through A_4 symmetry breaking},
  author = {Y. H. Ahn and Chian-Shu Chen},
  journal= {arXiv preprint arXiv:1001.2869},
  year   = {2010}
}

Comments

32 pages, 21 figures, 3 tables. Final version to appear in Phys. Rev. D

R2 v1 2026-06-21T14:35:42.886Z