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arXiv 0909.5456hep-ph
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超对称粒子相互作用的重整化群分析

Renormalization Group Analysis of Supersymmetric Particle Interactions

Andrew D. Box

摘要:

我们重新研究了最小超对称标准模型(MSSM)的无量纲和有量纲参数的重整化群方程(RGE),将1-loop阈值。包含这些阈值必然导致在树级相等的无量纲耦合之间的分裂。假设超对称性破坏机制不引入新的代际耦合,我们提出了最一般的形式为高尺度,软超对称性破坏(SSB)参数。以此作为我们的边界条件,我们考虑说明性的例子,数值解的RGE。在超对称大统一理论中,当超对称标量的标度与高吉诺和希格斯诺标度分离时,我们发现高吉诺质量统一关系可能被破坏到10%的量级。此外,我们考虑的最轻停止的味道违反衰变的魅力加上中性伴子的速度。我们发现,使用完整的RGE解决方案,而不是常用的“单步”集成的RGE可以定性地改变图片的事件拓扑从顶夸克对生产,或从胶子生产,如果胶子停止加上顶部是占主导地位的胶子衰变模式。

英文摘要:

We reexamine the renormalization group equations (RGEs) for the dimensionless and dimensionful parameters of the Minimal Supersymmetric Standard Model (MSSM), incorporating 1-loop thresholds. The inclusion of these thresholds necessarily results in splitting between dimensionless couplings which are equal at the tree level. Assuming that the SUSY-breaking mechanism does not introduce new intergenerational couplings, we present the most general form for high-scale, soft-SUSY-breaking (SSB) parameters. With this as our boundary condition, we consider illustrative examples of numerical solutions to the RGEs. In a supersymmetric grand unified theory with the scale of SUSY scalars split from that of gauginos and higgsinos, we find that the gaugino mass unification relation may be violated to the order of 10%. Further, we consider the rate for the flavor violating decay of the lightest stop to charm plus neutralino. We find that using the complete RGE solution as opposed to the commonly used `single-step' integration of the RGEs can qualitatively change the picture of event-topologies from top-squark pair production, or from gluino production if gluino to stop plus top is the dominant gluino decay mode.

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