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arXiv 2407.00732hep-phhep-ex
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通用跷跷板模型中的第三代夸克质量等级与味改变中性流

The third family quark mass hierarchy and FCNC in the universal seesaw model

Takuya Morozumi, Albertus Hariwangsa Panuluh

AI总结:

该研究针对具有$\rm SU(2)_L \times SU(2)_R \times U(1)_{Y'}$规范对称性的通用跷跷板模型,推导了夸克、希格斯及规范场的拉格朗日量,同时研究了相关粒子相互作用中的味改变中性流,为解释第三代夸克质量等级提供理论支撑。

摘要:

我们研究了具有$\boldsymbol{\rm SU(2)_L \times SU(2)_R \times U(1)_{Y'}}$规范对称性的通用跷跷板模型(universal seesaw model)的夸克部分,研究在两个最轻夸克家族无质量的情形下展开。该模型旨在通过为每个夸克引入一个类矢量夸克(vector-like quark,VLQ)伙伴,来解释第三代夸克的质量等级。模型中引入了$\rm SU(2)_L$和$\rm SU(2)_R$希格斯二重态。我们从满足$\rm SU(2)_L \times SU(2)_R \times U(1)_{Y'}$规范对称性的拉格朗日量出发,明确推导了夸克部分、希格斯部分以及规范场动能项的拉格朗日量,并给出了对称性破缺各阶段中保留剩余规范对称性的拉格朗日量形式。此外,我们还研究了希格斯粒子($h$)和$Z$玻色子与顶夸克、重顶夸克、底夸克、重底夸克相互作用过程中的味改变中性流(flavor-changing neutral currents,FCNC)。

英文摘要:

We present the study of the quark sector of the universal seesaw model with $\mathrm{SU(2)_L \times SU(2)_R \times U(1)_{Y'}}$ gauge symmetry in the massless case of the two lightest quark families. This model aims to explain the mass hierarchy of the third family quark by introducing a vector-like quark (VLQ) partner for each quark. In this model, we introduce $\mathrm{SU(2)_L}$ and $\mathrm{SU(2)_R}$ Higgs doublets. We derive explicitly the Lagrangian for the quark sector, Higgs sector, and kinetic terms of the gauge fields, starting from the Lagrangian, which is invariant under $\mathrm{SU(2)_L \times SU(2)_R \times U(1)_{Y'}}$ gauge symmetry. At each stage of the symmetry breaking, we present the Lagrangian with the remaining gauge symmetry. Additionally, we investigate the flavor-changing neutral currents (FCNC) of Higgs ($h$) and $Z$-boson in the interaction with the top, heavy top, bottom, and heavy bottom quark.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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