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arXiv 0802.2584hep-ph
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R宇称破坏的一个理论框架

A Theoretical Framework for R-parity Violation

Minoru Kuriyama, Hiroto Nakajima, Taizan Watari

摘要:

我们提出了一个理论框架的R-宇称破坏。它是通过杂化弦论的一类Calabi-Yau紧化来实现的。由于基于自发破缺U(1)对称的电荷计数的选择规则,在超势中三线性R宇称破缺要么不存在,要么小到可以忽略不计。虽然这样的选择规则一般不能应用于低能有效超势中的不可重整化算子,但它对低能自由度中的三线性项是有效的,因此可以用来解决最小超对称标准模型中的4维质子衰变问题。双线性R-宇称破坏产生,但有很好的理由,他们足够小,以满足其上限从中微子质量和洗出的重子/轻子不对称。可以生成所有违反R-奇偶性的5维算子。在这个理论框架下,核子可以通过结合了5维和双线性R宇称破坏算子的方交换图衰变。预测了B-L破缺中子衰变。

英文摘要:

We propose a theoretical framework for R-parity violation. It is realized by a class of Calabi--Yau compactification of Heterotic string theory. Trilinear R-parity violation in superpotential is either absent or negligibly small without an unbroken symmetry, due to a selection rule based on charge counting of a spontaneously broken U(1) symmetry. Although such a selection rule cannot be applied in general to non-renormalizable operators in the low-energy effective superpotential, it is valid for terms trilinear in low-energy degrees of freedom, and hence can be used as a solution to the dimension-4 proton decay problem in the minimal supersymmetric standard model. Bilinear R-parity violation is generated, but there are good reasons why they are small enough to satisfy its upper bounds from neutrino mass and washout of baryon/lepton asymmetry. All R-parity violating dimension-5 operators can be generated. In this theoretical framework, nucleons can decay through squark-exchange diagrams combining dimension-5 and bilinear R-parity violating operators. B-L breaking neutron decay is predicted.

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