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arXiv 1002.4798hep-ph
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自发破缺味对称有效理论中的Goldstone玻色子

Goldstone Bosons in Effective Theories with Spontaneously Broken Flavour Symmetry

Michaela E. Albrecht, Thorsten Feldmann, Thomas Mannel

摘要:

标准模型(SM)规范扇区的味对称性被费米子汤川耦合打破。推广汤川矩阵标量spurion场,人们可以打破味道对称自发地给予适当的真空期望值(VEVs)的spurion场,并遇到Goldstone模式的每一个破味对称发电机。在本文中,我们指出了与Goldstone玻色子可能的动力学解释有关的各个方面:(i)在具有局域味对称性的有效理论框架中,Goldstone场代表了大质量规范玻色子的纵模。后者的频谱如下序列的味道对称性破缺有关的层次结构的汤川耦合和味道混合角。(ii)规范异常可以通过添加高维算子来一致地处理。(iii)将味对称群的U(1)因子作为全局对称,相应的Goldstone模式表现为轴子,可以通过修改的Peccei-Quinn机制来解决强CP问题。(iv)味对称性破缺的动力学图像意味着新的味变化中性流的来源,它产生于整合出重标量spurion场和重规范玻色子。有效算子的系数遵循最小味违反原则。

英文摘要:

The Flavour Symmetry of the Standard Model (SM) gauge sector is broken by the fermion Yukawa couplings. Promoting the Yukawa matrices to scalar spurion fields, one can break the flavour symmetry spontaneously by giving appropriate vacuum expectation values (VEVs) to the spurion fields, and one encounters Goldstone modes for every broken flavour symmetry generator. In this paper, we point out various aspects related to the possible dynamical interpretation of the Goldstone bosons: (i) In an effective-theory framework with local flavour symmetry, the Goldstone fields represent the longitudinal modes for massive gauge bosons. The spectrum of the latter follows the sequence of flavour-symmetry breaking related to the hierarchies in Yukawa couplings and flavour mixing angles. (ii) Gauge anomalies can be consistently treated by adding higher-dimensional operators. (iii) Leaving the U(1) factors of the flavour symmetry group as global symmetries, the respective Goldstone modes behave as axions which can be used to resolve the strong CP problem by a modified Peccei-Quinn mechanism. (iv) The dynamical picture of flavour symmetry breaking implies new sources of flavour-changing neutral currents, which arise from integrating out heavy scalar spurion fields and heavy gauge bosons. The coefficients of the effective operators follow the minimal-flavour violation principle.

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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