Domino theory of flavor
Domino theory of flavor
复制标题
风味多米诺骨牌理论
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
S. Rajendran
中科院分区：
文献类型：
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作者：
P. Graham;S. Rajendran
我们认为费米子质量和混合是以特定模式组织的。连续世代之间近似相等的层次结构、混合角的大小、顶夸克的重量以及近似的下轻子相等都可以被许多风味模型所适应，但可以显得特别。我们提出了一个简单的预测机制来解释这些模式。所有世代都受到民主对待，风味对称性仅被风味空间中允许的两个耦合所集体破坏，即向量和矩阵，具有任意 {Omicron}(1) 条目。重复使用这些破坏风味对称性的杂散辐射产生具有自然层次结构的汤川耦合。我们通过分裂超对称大统一框架中的两个模型证明了这一想法，在统一尺度上具有最小的附加粒子含量。尽管风味是在 GUT 尺度上产生的，但仍有一些潜在可测试的预测。在我们的最小模型中，精确 b-{tau} 统一的通常预测被 SU(5) 破坏关系 m{sub {tau}}/m{sub b} = 3/2 所取代，与观察结果更加一致。费米子质量中的其他 SU(5) 破坏效应很容易直接由风味模型本身产生。触发风味产生的对称性破缺必然会产生更多的轴子，从而解决强 CP 问题。这些理论包含长寿命粒子，其衰变可能会在大型强子对撞机上产生惊人的特征，并可能解决原始的锂问题。这些模型还给出了新的质子衰变特征，可以通过下一代实验进行探测。各种质子衰变通道的测量直接探测风味对称性破坏耦合。在这种情况下，希格斯粒子的质量预计将在 150 GeV 附近。« less
We argue that the fermion masses and mixings are organized in a specific pattern. The approximately equal hierarchies between successive generations, the sizes of the mixing angles, the heaviness of just the top quark, and the approximate down-lepton equality can all be accommodated by many flavor models but can appear ad hoc. We present a simple, predictive mechanism to explain these patterns. All generations are treated democratically and the flavor symmetries are broken collectively by only two allowed couplings in flavor-space, a vector and matrix, with arbitrary {Omicron}(1) entries. Repeated use of these flavor symmetry breaking spurions radiatively generates the Yukawa couplings with a natural hierarchy. We demonstrate this idea with two models in a split supersymmetric grand unified framework, with minimal additional particle content at the unification scale. Although flavor is generated at the GUT scale, there are several potentially testable predictions. In our minimal model the usual prediction of exact b-{tau} unification is replaced by the SU(5) breaking relation m{sub {tau}}/m{sub b} = 3/2, in better agreement with observations. Other SU(5) breaking effects in the fermion masses can easily arise directly from the flavor model itself. The symmetry breaking that triggers the generation of flavor necessarily gives risemore » to an axion, solving the strong CP problem. These theories contain long-lived particles whose decays could give striking signatures at the LHC and may solve the primordial Lithium problems. These models also give novel proton decay signatures which can be probed by the next generation of experiments. Measurement of the various proton decay channels directly probes the flavor symmetry breaking couplings. In this scenario the Higgs mass is predicted to lie in a range near 150 GeV.« less