arXiv 1003.32672010-03hep-ph

第四代动力学对称破缺

Dynamical Symmetry Breaking With a Fourth Generation

D. Delepine, M. Napsuciale, C. A. Vaquera-Araujo

备注：: 20 pages, 7 figures. New section added
发表信息：: Phys. Rev. D 84, 033008 (2011)
DOI：: 10.1103/PhysRevD.84.033008

摘要：

在标准模型中加入第四代辐射，并假设第四代辐射在某一截止值Λ之前是有效的，我们证明了第四代辐射的辐射修正破坏了电弱对称性。第四代的影响是孤立的使用拉格朗日与一个真正的标量没有自相互作用的经典水平。对于与电弱精确数据（包括B \rightarrow K π CP不对称性）一致的第四代质量，我们得到了几百GeV量级的希格斯质量和大约1-2 TeV的截断值Λ。我们研究的可靠性的微扰处理用于获得这些结果考虑到运行的汤川耦合的第四代夸克的帮助下的重整化群（RG）方程，发现类似的允许值的希格斯质量，但略低的截止由于微扰制度的打破。如此低的截止值意味着描述能量高于Λ的电弱相互作用所需的新物理效应应该在LHC上可测量。我们使用的最小超对称扩展的标准模型与四代作为一个明确的例子模型实现动态电弱对称性破缺辐射校正和包含新的物理。在这里，截止被取代的质量的squark和电弱对称性破缺的辐射校正需要的squark质量的顺序为1 TeV。

英文摘要：

Adding a fourth generation to the Standard Model and assuming it to be valid up to some cutoff Λ, we show that electroweak symmetry is broken by radiative corrections due to the fourth generation. The effects of the fourth generation are isolated using a Lagrangian with a genuine scalar without self-interactions at the classical level. For masses of the fourth generation consistent with electroweak precision data (including the B \rightarrow K π CP asymmetries) we obtain a Higgs mass of the order of a few hundreds GeV and a cutoff Λ around 1-2 TeV. We study the reliability of the perturbative treatment used to obtain these results taking into account the running of the Yukawa couplings of the fourth quark generation with the aid of the Renormalization Group (RG) equations, finding similar allowed values for the Higgs mass but a slightly lower cut-off due to the breaking of the perturbative regime. Such low cut-off means that the effects of new physics needed to describe electroweak interactions at energy above Λ should be measurable at the LHC. We use the minimal supersymmetric extension of the standard model with four generations as an explicit example of models realizing the dynamical electroweak symmetry breaking by radiative corrections and containing new physics. Here, the cutoff is replaced by the masses of the squarks and electroweak symmetry breaking by radiative corrections requires the squark masses to be of the order of 1 TeV.

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