Neutrino masses and lepton flavor violation in thick brane scenarios
Neutrino masses and lepton flavor violation in thick brane scenarios
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厚膜场景中的中微子质量和轻子味道违规
DOI：
10.1103/physrevd.64.073005
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发表时间：
2001
影响因子：
5
通讯作者：
M. N. Rebelo
中科院分区：
文献类型：
--
作者：
G. Barenboim;G. Branco;A. Gouvea;M. N. Rebelo
我们讨论了“肥膜”范式中的轻子味破坏和中微子质量问题，其中味的变化过程通过在厚膜中不同位置(额外维度)的不同费米子波函数的局域化来抑制。我们研究了在这种情况下，抑制轻子数违反带电轻子衰变对轻子质量和混合角的影响。特别地，我们发现带电轻子质量矩阵被约束为准对角线。我们进一步考虑是否可以用同样的范式通过考虑膜中三个右手中微子的存在来自然地解释小狄拉克中微子质量，并讨论了获得现象上可行的中微子质量和混合角的要求。最后，我们检验了中微子通过在遥远的膜中破坏轻子数来获得小的Majorana质量的模型，并表明，如果脂肪膜范式是解决没有轻子数破坏带电轻子衰变的解决方案，这样的模型预测，在没有味道对称性的情况下，带电轻子的味道破坏将在下一轮罕见的Muon/tau衰变实验中观察到。
We address the issue of lepton flavour violation and neutrino masses in the \fat-brane" paradigm, where flavour changing processes are suppressed by localising dierent fermion eld wave-functions at dierent positions (in the extra dimensions) in a thick brane. We study the consequences of suppressing lepton number violating charged lepton decays within this scenario for lepton masses and mixing angles. In particular, we nd that charged lepton mass matrices are constrained to be quasi-diagonal. We further consider whether the same paradigm can be used to naturally explain small Dirac neutrino masses by considering the existence of three right-handed neutrinos in the brane, and discuss the requirements to obtain phenomenologically viable neutrino masses and mixing angles. Finally, we examine models where neutrinos obtain a small Majorana mass by breaking lepton number in a far away brane and show that, if the fat-brane paradigm is the solution to the absence of lepton number violating charged lepton decays, such models predict, in the absence of flavour symmetries, that charged lepton flavour violation will be observed in the next round of rare muon/tau decay experiments.