高能对撞机上R宇称破缺效应的研究

Among all the extensions of the SM, the Minimal Supersymmetric Standard Model (MSSM) is one of the most attractive candidates due to its elegant symmetry and physical connotation.?The existence of an approximate R-parity symmetry would affect in a deep way the conventional framework of the Minimal Supersymmetric Standard Model where an exact R-parity symmetry is built-in by assumption. There are a lot of works have been done to detect R-parity violation effect in the theoretical and experimental aspects. However, up to now the current experiments can only give some upper limits on the R parity violation parameters. It is still a very important task to seek R-parity violation signals or give more strict constraits on the R-parity voliation parameters in the future experiments. In our work, we plan to calculate the production and decay of supersymmetric particle processes preciesely in the framework of the Minimal Supersymmetric Standard Model with R-parity violation, and give more accurate theoretical prediction. We adopt a proper event selection to separate signals from the background. Our work will provide theoretical support for seeking R parity violation effects or give more strict constraits on the R-parity violation parameters.

最小超对称标准模型（MSSM）是所有扩展模型中被认为最有吸引力的模型之一。其中，R宇称在超对称理论的现象学中有着非常重要的地位。理论和实验方面已经在研究R宇称破缺相互作用的效应方面做了大量的工作。然而，目前的实验只能给出某些R宇称破缺参数的上限。在未来的实验中寻找R宇称破缺的信号或给出参数上更严格的限制仍然是非常重要的工作。本项目计划在R宇称破缺的MSSM下，通过LHC和ILC上超对称粒子的衰变和产生过程NLO的计算，给出精确的理论预言，根据过程特征选取合适的事例判选条件和本底排除方法来分析信号，为寻找R宇称破缺的效应或给出R宇称破缺参数更严格的限制提供理论支持。

最小超对称标准模型（MSSM）是所有扩展模型中被认为最有吸引力的模型之一。其中，R宇称在超对称理论的现象学中有着非常重要的地位。理论和实验方面已经在研究R宇称破缺相互作用的效应方面做了大量的工作。本项目主要研究在R宇称破缺的MSSM下，通过LHC和ILC上超对称粒子的衰变和产生过程NLO的计算，给出精确的理论预言，根据过程特征选取合适的事例判选条件和本底排除方法来分析信号，为寻找R宇称破缺的效应或给出R宇称破缺参数更严格的限制提供理论支持。在该项目的支持下，我们对几个重要的过程进行了计算和数据分析，提高了理论计算的精度，为实验提供了参考数据。