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arXiv 1111.2481hep-phhep-th
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三代非反常离散R-对称性

Non-Anomalous Discrete R-symmetry Decrees Three Generations

Jason L. Evans, Masahiro Ibe, John Kehayias, Tsutomu T. Yanagida

摘要:

我们表明,超过两代的夸克和轻子需要有一个异常自由的离散R-对称性大于R-宇称,超对称标准模型可以最低限度地嵌入到一个大统一理论。这通过一个离散的R-对称性将对世代数的解释与看似无关的问题联系起来,如超对称破缺、质子衰变、μ问题和宇宙学常数。我们还表明,三代是唯一需要的非异常离散R-对称类的大统一理论,如(半)简单的规范群的基础上。

英文摘要:

We show that more than two generations of quarks and leptons are required to have an anomaly free discrete R-symmetry larger than R-parity, provided that the supersymmetric Standard Model can be minimally embedded into a grand unified theory. This connects an explanation for the number of generations with seemingly unrelated problems like supersymmetry breaking, proton decay, the mu problem, and the cosmological constant through a discrete R-symmetry. We also show that three generations is uniquely required by a non-anomalous discrete R-symmetry in classes of grand unified theories such as the ones based on (semi-)simple gauge groups.

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