arXiv 1206.70442012-06-27hep-ph

具有最大CP对称性的双Higgs偶态模型的Monte-Carlo事件产生

Monte-Carlo event generation for a two-Higgs-doublet model with maximal CP symmetry

Johann Brehmer

备注：: BSc Thesis in Physics at the University of Heidelberg

摘要：

最近提出了一个在广义CP变换下具有最大对称性的双Higgs二重态模型MCPM。该理论具有独特的费米子质谱，虽然不能精确描述自然，但提供了一个很好的近似。它还预言了五个具有特定签名的希格斯玻色子的存在。在这篇论文中，我实现了MCPM到蒙特卡罗事件生成包MadGraph，允许模拟任何MCPM树级过程。生成的事件是标准化的格式，可以用于进一步分析的工具，如PYTHIA或GEANT，最终导致与实验数据的比较和排除或发现的理论。以不同的方式成功地验证了实施。然后，它被用于MCPM信号事件与SM背景和先前对新物理的搜索的第一次比较，暗示未来几年LHC预期的数据可能会提供排除限制或显示该模型的签名。

英文摘要：

Recently a two-Higgs-doublet model with maximal symmetry under generalised CP transformations, the MCPM, has been proposed. The theory features a unique fermion mass spectrum which, although not describing nature precisely, provides a good approximation. It also predicts the existence of five Higgs bosons with a particular signature. In this thesis I implemented the MCPM into the Monte-Carlo event generation package MadGraph, allowing the simulation of any MCPM tree-level process. The generated events are in a standardised format and can be used for further analysis with tools such as PYTHIA or GEANT, eventually leading to the comparison with experimental data and the exclusion or discovery of the theory. The implementation was successfully validated in different ways. It was then used for a first comparison of the MCPM signal events with the SM background and previous searches for new physics, hinting that the data expected at the LHC in the next years might provide exclusion limits or show signatures of this model.

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