LHC上多粒子物理过程的研究

Calculation of the multi-particle processes is the essential contents,as well as an challenge issue in LHC physics. We proposal a new method for calculating amplitudes in which the Feynman diagrams are first coded as a set of numbers and then calculated directly and dynamicly. As a result, the calculations of the Feynman diagrams for complicated multi-particle processes are realized automaticly. It will considerably enhance the maplitude of the calculation ability for massive multi-particle processes related to the signal and the background.It is important for experiments at LHC. We plan to apply the method to calculate the production rate of the 2->6 processes. Esepecially, we plan to calculate the processes such as pp->bbbbww+X, pp->QQQQQQ+X, pp->bbjjjj+X，which are important for studying Higgs particle, Top quark physics, looking for new physics and flavor physics.

计算含有多个粒子的物理过程是LHC物理信号背景研究中的重要内容，也是理论上极富挑战性的问题。本项目提出一种高效的计算费曼图的方法，其实质是对通过对费曼图进行编码、直接地、自动的、动态的计算费曼图振幅。可用于以便实现用于任意过程的多粒子态复杂过程费曼图的自动计算，也将大大提高领头阶有质量多粒子物理过程的计算能力，许多相关背景和信号过程的计算能力，对于开展LHC上的实验研究工作有重要意义。项目拟重点开展2->6有质量粒子物理过程的计算，特别是标准模型中pp->bbbbww+X, pp->QQQQQQ+X, pp->bbjjjj+X等过程的计算，这些过程对于在LHC上研究Higgs粒子物理、Top夸克物理、寻找新物理及重味物理重要意义。