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arXiv 1012.5919hep-ph
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双Higgs二重态模型中的味物理

Flavour Physics in two-Higgs-doublet models

Martin Jung

摘要:

尽管标准模型取得了巨大的成功,但关于扩展的必要性的论点是令人信服的。一个有吸引力的选择是由双希格斯双重模型提供的,由于它们的简单性和它们是一些更完整的理论的低能极限。在最一般的模型中,中性标量的费米子耦合是非对角的,因此会产生不必要的中性流现象。已经开发了抑制FCNC的不同方法,从而产生了2 HDM的各种具体实施方式。在这次演讲中讨论了其中的三个,比较它们在味道观测中的现象学影响:离散Z2对称性的使用,在最小味道违反情况下假设去耦极限的扩展,以及对齐的双希格斯双重模型。所有这些都导致了树水平的味道改变中性电流的缺乏。它们的不同的唯象后果被证明为一个选择的可观测量,即(半)轻子衰变,B->X_s伽玛和混合在B 0_d,s-系统。

英文摘要:

Despite the tremendous success of the Standard Model, the arguments for the necessity of an extension are compelling. An attractive option is provided by Two-Higgs-Doublet models, due to their simplicity and them being the low-energy limit of some more complete theories. In the most general version of the model, the fermionic couplings of the neutral scalars are non-diagonal in flavour and, therefore, generate unwanted flavour-changing neutral-current phenomena. Different ways to suppress FCNCs have been developed, giving rise to a variety of specific implementations of the 2HDM. Three of these are discussed in this talk, comparing their phenomenological influence in flavour observables: The use of a discrete Z2-symmetry, an expansion around this limit in a minimal flavour violation scenario assuming the decoupling limit, and the Aligned Two-Higgs-Doublet Model. All of these result in the absence of tree-level flavour-changing neutral currents. Their different phenomenological consequences are demonstrated for a selection of observables, namely (semi-) leptonic decays, B->X_s gamma and mixing in the B0_d,s-systems.

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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