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arXiv 1010.2347hep-ph
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B物理中CP违反2HDM的意义

Implications of CP violating 2HDM in B physics

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$U(1)^3$对称性下是不变的。在任意弱基下这种对称性的定义不依赖于真空期望值比等Higgs参数的条件下,可以识别出一类两个Higgs二重态模型(2HDM),其中不存在通常存在于2HDM中的树能级变味中性流.然而,与I型或II型希格斯偶线模型不同的是,这些模型中的带电希格斯耦合包含额外的依赖于味道的CP破坏相。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,但在$B_d$和$B_s$介子混合相同的新的物理相。

英文摘要:

The charged fermion mass matrices are invariant under $U(1)^3$ symmetry linked to the fermion number transformation. Under the condition that the definition of this symmetry in arbitrary weak basis does not depend upon Higgs parameters such as ratio of vacuum expectation values, a class of two Higgs doublet models (2HDM) can be identified in which tree level flavor changing neutral currents normally present in 2HDM are absent. However unlike the type I or type II Higgs doublet models, the charged Higgs couplings in these models contain additional flavor 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 phases in the $B_d$ and $B_s$ meson mixing.

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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