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arXiv 0910.0823hep-ph
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离散最小味违反

Discrete Minimal Flavour Violation

R. Zwicky, T. Fischbacher

摘要:

我们调查的后果,取代连续味对称性的最小味违反一个离散组。戈德斯通玻色子,从连续味对称性的破坏,一般导致新的味结构的界限由许多数量级以上的TeV尺度。离散对称性中戈德斯通玻色子的缺失构成了我们工作的主要动机。在Delta F = 2过程由两个后续Delta F = 1跃迁生成的情况下,四个类晶体组Sigma(168)、Sigma(72 phi)、Sigma(216 phi)和Sigma(360 phi)为离散TeV级MFV场景提供足够的保护。

英文摘要:

We investigate the consequences of replacing the continuous flavour symmetry of minimal flavour violation by a discrete group. Goldstone bosons, resulting from the breaking of the continuous flavour symmetry, generically lead to bounds on new flavour structure by many orders of magnitude above the TeV-scale. The absence of Goldstone bosons for discrete symmetries constitutes the primary motivation of our work. The four crystal-like groups Sigma(168), Sigma(72phi), Sigma(216phi) and Sigma(360phi)$ provide enough protection for a discrete TeV-scale MFV scenario in the case where Delta F = 2 processes are generated by two subsequent Delta F = 1 transitions.

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