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arXiv 0712.2612hep-ph
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TeV-scale II型跷跷板模型和可能的对撞机信号

TeV-scale Type-II Seesaw Models and Possible Collider Signatures

Wei Chao, Shu Luo, Zhi-zhong Xing, Shun Zhou

摘要:

标准模型的一个自然扩展是引入一个希格斯三重态和三个右手马约拉纳中微子,导致6 \times 6中微子质量矩阵。我们发现,三个轻马约拉纳中微子(即,在此跷跷板模型中,质量本征态(ν_e,ν_μ和ν_τ)是精确无质量的当且仅当M_L = M_D M^{-1}_R M^T_D精确成立。我们提出了三个简单的A_4 \times U(1)_X味对称性破缺的II型跷跷板方案来解释观测到的中微子质谱和中微子混合模式。这样一个TeV尺度的中微子模型可以通过两种互补的方式进行检验:(1)寻找右手Majorana中微子和双电荷Higgs粒子引起的轻子数破坏的可能的对撞机特征;(2)在未来的长基线中微子振荡实验中寻找3 \times 3中微子混合矩阵的么正性破坏的可能后果。

英文摘要:

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 ν_e, ν_μand ν_τ) 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.

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