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arXiv 0812.0511hep-ph
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具有混合规范和引力中介的超对称模型中的味变化过程

Flavor Changing Processes in Supersymmetric Models with Hybrid Gauge- and Gravity-Mediation

Gudrun Hiller, Yonit Hochberg, Yosef Nir

摘要:

我们考虑超对称模型,其中规范调解提供的软超对称性破缺项的主要贡献,而重力调解提供次主导但不可忽略的贡献。我们进一步假设,重力介导的贡献受到选择规则,遵循Froggatt-Nielsen对称性。这类模型构成了可行的和自然的非最小味道违反模型的示例。中性K系统中混合的限制意味着对中性B_d和B_s系统中混合的标准模型预测的修正一般最多在百分比水平上,但对于大的$\tan β$可以达到10%的数量级。中性D系统混合的修正一般最多是百分之几的数量级,但在模型的特殊子类中,它们可以是一阶的。我们指出$ΔB=1$过程相关的风味违反混合调解。

英文摘要:

We consider supersymmetric models where gauge mediation provides the dominant contributions to the soft supersymmetry breaking terms while gravity mediation provides sub-dominant yet non-negligible contributions. We further assume that the gravity-mediated contributions are subject to selection rules that follow from a Froggatt-Nielsen symmetry. This class of models constitutes an example of viable and natural non-minimally flavor violating models. The constraints from mixing in the neutral K system imply that the modifications to the Standard Model predictions for mixing in the neutral B_d and B_s systems are generically at most at the percent level, but can be of order ten percent for large $\tan β$. The modifications for the neutral D system mixing are generically at most of order a few percent, but in a special subclass of models they can be of order one. We point out $ΔB=1$ processes relevant for flavor violation in hybrid mediation.

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