关于331模型中的代际区分研究
On the family discrimination in 331-model
AI总结：
本文研究331模型中哪一代夸克被区别对待的判别问题，分析其对夸克味结构的影响，并证明125 GeV希格斯粒子味破坏耦合被压低的原因。
摘要：
在所谓的331模型中，规范反常只有在存在三代费米子时才会抵消。这要求其中一代夸克与其他两代处于不同的表示中。但哪一代被区别对待呢？在本工作中，我们研究了不同对待的代的选择如何影响夸克味结构，以及如何从实验中推断出被区分的代。我们研究了一个基于β=-1/√3的一般模型，该模型包含与标准模型夸克具有相同电荷的奇异夸克。我们充分考虑了奇异夸克与标准模型夸克混合的效应，这在文献中常被忽略。我们还将特别关注125 GeV的希格斯粒子，并解析地证明其与标准模型夸克之间的味破坏耦合为何被压低。
英文摘要：
In the so-called 331-models the gauge anomalies cancel only if there are three generations of fermions. This requires one of the quark generations to be in a different representation than the other two. But which generation is treated differently? In this work we study how the choice of differently treated generation effects the quark flavour structure and how the discriminated generation can be deduced from experiments. We study a general model based on $β=-1/\sqrt{3}$, which contains exotic quarks with same electric charges as SM quarks. We take fully into account the effects from exotic quark mixing with the SM quarks, which is often omitted in literature. We will also pay particular attention to $125$ GeV Higgs, and show analytically why its flavour violating couplings between SM quarks are suppressed.
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