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arXiv 1111.7289hep-ph
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MSSM复合体中重标量顶夸克衰变的单圈分析

Heavy Scalar Top Quark Decays in the Complex MSSM: A Full One-Loop Analysis

T. Fritzsche, S. Heinemeyer, H. Rzehak, C. Schappacher

摘要:

在无世代混合的最小超对称复参数标准模型中计算了重标量顶夸克的所有两体衰变模。评估是基于一个完整的单回路计算的所有衰变通道,也包括硬QED和QCD辐射。详细描述了复参数的重正化。数值分析了重标量顶夸克衰变对相关cMSSM参数的依赖关系,包括衰变为希格斯玻色子玻色子和另一个标量夸克,或衰变为顶夸克和最轻的中性伴子.我们发现相当大的贡献,许多部分衰变宽度和分支比。它们大约是树级结果的O(10%),但可以高达30%或更高。这些贡献是重要的标量顶夸克衰变在LHC的正确解释,如果运动学允许,在ILC。重标量顶夸克的分支比的计算将在Fortran程序FeynHiggs中实现。

英文摘要:

We evaluate all two-body decay modes of the heavy scalar top quark in the Minimal Supersymmetric Standard Model with complex parameters (cMSSM) and no generation mixing. The evaluation is based on a full one-loop calculation of all decay channels, also including hard QED and QCD radiation. The renormalization of the complex parameters is described in detail. The dependence of the heavy scalar top quark decay on the relevant cMSSM parameters is analyzed numerically, including also the decay to Higgs bosons and another scalar quark or to a top quark and the lightest neutralino. We find sizable contributions to many partial decay widths and branching ratios. They are roughly of O(10%) of the tree-level results, but can go up to 30% or higher. These contributions are important for the correct interpretation of scalar top quark decays at the LHC and, if kinematically allowed, at the ILC. The evaluation of the branching ratios of the heavy scalar top quark will be implemented into the Fortran code FeynHiggs.

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