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arXiv 0710.5320hep-ph
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MSSM中h_a --> h_b h_c衰变的精确预言

Precise predictions for h_a --> h_b h_c decays in the complex MSSM

K. E. Williams, G. Weiglein

摘要:

本文给出了复参数MSSM中中性希格斯玻色子玻色子(h_a)衰变为较轻中性希格斯玻色子玻色子(h_b,h_c)的完整单圈结果。结果得到的费曼图解法,考虑到完全依赖于超对称粒子的光谱和所有复杂的相位的超对称参数。真正的三重希格斯顶点的贡献补充了两个循环的传播类型的修正,产生目前最精确的预测这类过程。真正的顶点校正结果是非常重要的,产生一个大的增加相比,基于树级顶点的预测的衰减宽度。新的结果被用来分析从LEP希格斯粒子搜索的实验极限的影响参数空间与一个非常轻的MSSM希格斯玻色子。据发现,CPX基准方案的参数空间的一个重要部分存在的通道,涉及衰变h_2 --> h_1 h_1具有最高的搜索灵敏度,并确认存在一个未排除的区域与M_{h_1} \approx 45 GeV。

英文摘要:

Complete one-loop results for the decay widths of neutral Higgs bosons (h_a) into lighter neutral Higgs bosons (h_b, h_c) are presented for the MSSM with complex parameters. The results are obtained in the Feynman-diagrammatic approach, taking into account the full dependence on the spectrum of supersymmetric particles and all complex phases of the supersymmetric parameters. The genuine triple-Higgs vertex contributions are supplemented with two-loop propagator-type corrections, yielding the currently most precise prediction for this class of processes. The genuine vertex corrections turn out to be very important, yielding a large increase of the decay width compared to a prediction based on the tree-level vertex. The new results are used to analyse the impact of the experimental limits from the LEP Higgs searches on the parameter space with a very light MSSM Higgs boson. It is found that a significant part of the parameter space of the CPX benchmark scenario exists where channels involving the decay h_2 --> h_1 h_1 have the highest search sensitivity, and the existence of an unexcluded region with M_{h_1} \approx 45 GeV is confirmed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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