Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-17
Int.J.Mod.Phys.A23:3420-3424,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages. Talk given by Wei Chao at the 4th International Conference on Flavor Physics, 24-28 September 2007, Beijing (to appea
Scientific paper
10.1142/S0217751X08042249
A natural extension of the standard model to accommodate massive neutrinos is to introduce one Higgs triplet and three right-handed Majorana neutrinos, leading to a 6 \times6 neutrino mass matrix. We show that three light Majorana neutrinos (i.e., the mass eigenstates of \nu_e, \nu_\mu and \nu_\tau) are exactly massless, if and only if M_L = M_D M^{-1}_R M^T_D exactly holds in this seesaw model. We propose three simple Type-II seesaw scenarios with broken A_4 \times U(1)_X flavor symmetry to interpret the observed neutrino mass spectrum and neutrino mixing pattern. Such a TeV-scale neutrino model can be tested in two complementary ways: (1) searching for possible collider signatures of lepton number violation induced by the right-handed Majorana neutrinos and doubly-charged Higgs particles; and (2) searching for possible consequences of unitarity violation of the 3\times 3 neutrino mixing matrix in the future long-baseline neutrino oscillation experiments.
Chao Wei
Luo Shu
Xing Zhi-zhong
Zhou Shun
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