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arXiv 1004.3637hep-ph
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费米子数守恒和两个没有树级变味中性流的Higgs偶极子模型

Fermion number conservation and two Higgs doublet models without tree level flavour changing neutral currents

Anjan S. Joshipura, Bhavik P. Kodrani

摘要:

带电费米子质量矩阵在与费米子数变换相关的$U(1)^3$对称性下总是不变的。通过要求任意弱基中这种对称性的定义与希格斯参数(如希格斯真空期望值的比值)无关,可以识别出一类两个希格斯偶极子模型(2HDM)。树水平的味道改变中性电流通常存在于2HDM是不存在的,在这类模型,但不像I型或II型希格斯偶模型,在这些模型中的带电希格斯耦合包含额外的味道依赖CP违反阶段。这些相位可以解释最近在$B_d$和$B_s$混合中超出标准模型CP破坏的暗示。特别是,有一个范围的参数,其中新的相位不有助于$K$介子CP破坏,但给相同的新的物理贡献的$B_d$和$B_s$介子混合。简要讨论了上述场景的具体模型实现。

英文摘要:

The charged fermion mass matrices are always invariant under $U(1)^3$ symmetry linked to the fermion number transformation. A class of two Higgs doublet models (2HDM) can be identified by requiring that the definition of this symmetry in an arbitrary weak basis be independent of Higgs parameters such as the ratio of the Higgs vacuum expectation values. The tree level flavour changing neutral currents normally present in 2HDM are absent in this class of models but unlike the type I or type II Higgs doublet models, the charged Higgs couplings in these models contain additional flavour dependent CP violating phases. These phases can account for the recent hints of the beyond standard model CP violation in the $B_d$ and $B_s$ mixing. In particular, there is a range of parameters in which new phases do not contribute to the $K$ meson CP violation but give identical new physics contribution to the $B_d$ and $B_s$ meson mixing. Specific model realizations of the above scenario are briefly discussed.

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