Neutrino masses and mixing, lightest neutralino decays and a solution to the μ problem in supersymmetry
Neutrino masses and mixing, lightest neutralino decays and a solution to the μ problem in supersymmetry
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DOI：
10.1088/1126-6708/2009/04/069
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发表时间：
2008-11
影响因子：
5.4
通讯作者：
Pradipta Ghosh;Sourov Roy
中科院分区：
文献类型：
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作者：
Pradipta Ghosh;Sourov Roy
我们详细研究了在三规范单态中微子和R宇称破坏的最小超对称标准模型的扩展中的中微子质量和混合模式。规范单重态中微子的马约拉纳质量以及通常的$\mu$项的希格斯超场产生在电弱尺度通过真空期望值的单重态中微子。由此产生的有效质量矩阵的三个轻中微子有贡献的跷跷板机制涉及的单重态中微子，以及由于与重中性中微子的混合。这个模型在文献中被称为“$\mu$ from $\nu$ supersymmetric standard model”（$\mu\nu$SSM）。我们表明，即使与味对角中微子汤川耦合，全球数据的三味中微子可以很好地占在这种情况下，在树的水平。我们还分析了在电荷和希格斯扇区的混合，并计算了最轻的超对称粒子的衰变。衰变分支比与中微子混合角有一定的相关性，这可以在LHC上进行测试。这种模型的其他一些唯象的影响进行了讨论。
We examine in detail the neutrino masses and mixing patterns in an extension of the minimal supersymmetric standard model with three gauge-singlet neutrinos and R-parity violation. The Majorana masses for the gauge-singlet neutrinos as well as the usual $\mu$-term for the Higgs superfields are generated at the electroweak scale through the vacuum expectation values of the singlet sneutrinos. The resulting effective mass matrix for the three light neutrinos have contributions from the seesaw mechanism involving the singlet neutrinos as well as due to the mixing with the heavy neutralinos. This model is popularly known in the literature as the "$\mu$ from $\nu$ supersymmetric standard model" ($\mu\nu$SSM). We show that even with flavour diagonal neutrino Yukawa couplings, the global data on three-flavour neutrinos can be well accounted for in this scenario, at the tree level. We also analyze the mixing in the chargino and the Higgs sector and calculate the decays of the lightest supersymmetric particle in this model. The decay branching ratios show certain correlations with the neutrino mixing angles, which can be tested at the LHC. Some other phenomenological implications of such a model have been discussed.