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首页> 外文期刊>Journal of Modern Physics >A Two-Higgs-Doublet Model without Flavor-Changing Neutral Currents at Tree-Level
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A Two-Higgs-Doublet Model without Flavor-Changing Neutral Currents at Tree-Level

机译:树型不改变中性电流的两希格斯-双重峰模型

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摘要

The flavor-changing neutral current (FCNC) problem at tree-level is a very critical defect of the two Higgs doublet extension of standard model (SM). In this article, a two-Higgs-doublet model (2HDM) in which such defects do not exist at all is to be demonstrated. The general pattern of matrix pairs which can be diagonalized simul-taneously by a same unitary transformation is proposed without extra constraints like symmetries or zeros in M matrices. Only an assumption of the hermiticity of mass matrices is employed in the derivation. With this assumption, number of parameters in the mass matrix of a specific fermion type is reduced from eighteen down to five. Eigenvalues and eigenvectors are analytically derived and it is surprising that unitary transformation matrix thus derived depends on only two parameters. It is a very general and elegant way to solve the tree-level FCNC problem radically and it includes previous similar models as special cases with specific parameter values.
机译:树级别的变味中性电流(FCNC)问题是标准模型(SM)的两个希格斯二重态扩展的一个非常关键的缺陷。在本文中,将演示其中根本不存在此类缺陷的两希格斯双峰模型(2HDM)。提出了可以通过相同的transformation变换同时对角线化的矩阵对的一般模式,而没有像M矩阵中的对称性或零这样的额外约束。在推导中仅采用质量矩阵的遗传率的假设。在此假设下,特定费米子类型的质量矩阵中的参数数量从18个减少到5个。特征值和特征向量是解析导出的,令人惊讶的是,由此导出的unit变换矩阵仅取决于两个参数。这是从根本上解决树级FCNC问题的一种非常通用且优雅的方法,它包括以前的类似模型,作为带有特定参数值的特殊情况。

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