Lepton flavor violation in the supersymmetric grand unified models with a lopsided mass matrix
Lepton flavor violation in the supersymmetric grand unified models with a lopsided mass matrix
复制标题
具有不平衡质量矩阵的超对称大统一模型中的轻子味道违规
DOI：
10.1103/physrevd.66.076006
复制
发表时间：
2001
影响因子：
5
通讯作者：
Yuan
中科院分区：
文献类型：
--
作者：
X. Bi;Yuan
中微子振荡实验中测得的微小中微子质量可以通过超对称跷跷板机制自然地解释。如果超对称破缺是由引力介导的，那么这种跷跷板模型就可以预言可观测到的轻子味破坏效应。在这篇工作中，我们研究了具有"不平衡"带电轻子质量矩阵的超对称跷跷板模型中的轻子味破坏过程μ-> egama。考虑了μ子反常磁矩的约束。我们发现，这样的模型通常预测的分支比μ-> egamma远高于目前的实验限制。因此，这一过程强烈地限制了这种类型的模型。这样的限制暗示了带电轻子质量矩阵的一种新形式，其特征在于2 - 3代和1 - 3代之间的元素具有"不平衡"结构。这种结构在带电轻子扇区产生很小的1 - 3混合和很大的1 - 2混合，自然导致小Br（mu-> egamma）和太阳中微子问题的大混合角解。
The tiny neutrino masses measured in neutrino oscillation experiments can be naturally explained via a supersymmetric seesaw mechanism. If supersymmetry breaking is mediated by gravity, such seesaw models may predict observable lepton flavor violating effects. In this work, we investigate the lepton flavor violating process mu-->egamma in supersymmetric seesaw models with a "lopsided" charged lepton mass matrix. Constraints set by the muon anomalous magnetic moment are taken into account. We find that such models generally predict a branching ratio for mu-->egamma far above the current experimental limit. Thus this process strongly constrains models of this type. Such restrictions suggest a novel form for the charged lepton mass matrix, featuring a "lopsided" structure for elements between both the 2-3 and the 1-3 generations. This structure produces a very small 1-3 mixing and a large 1-2 mixing in the charged lepton sector, leading naturally to a small Br(mu-->egamma) and to the large mixing angle solution for the solar neutrino problem.