寻找Higgs粒子以及精确测量其物理性质是大型强子对撞机（LHC）的一个重要物理实验目标。ATLAS和CMS合作组近来探测到一个新粒子作为Higgs粒子候选，实验上还需精确测量其性质，才能确定其是否为标准模型（SM）预言的Higgs粒子，任何和SM预言相背离的性质都预示着新物理存在的证据。本项目计划在SM和小Higgs模型下通过对LHC上Higgs伴随顶夸克对（或矢量玻色子对）产生过程的NLO QCD修正研究，精确检验Higgs与顶夸克（或矢量玻色子）的耦合特性，分析各可观测量与小 Higgs模型参数的关系以及它们在两种模型下的差别，给出LHC上可能存在新物理信号的小Higgs模型参数空间以及鉴别新物理信号的方法，为LHC实验上精确测量Higgs与顶夸克（或矢量玻色子）的耦合性质以及给出小Higgs模型参数更严格的限制提供精确的理论依据。

One of the main objectives of the experiments at the Large Hadron Collider (LHC) is to search for Higgs boson and precisely measure its properties. Recently, the ATLAS and CMS Collaborations at the LHC find a new particle as the candidate of Higgs boson. But the experimenters need to precisely measure its properties before determining whether it is predicted Standard Model (SM) Higgs boson. Any deviation from the SM prediction hints at the existence of new physics beyond the SM. In this project, we will study the NLO QCD corrections to Higgs boson production in association with a top quark pair (or vector boson pair) at the LHC in the SM and Little Higgs Model (LHM). Through this study, we can precisely test the couplings of Higgs boson with top quark (or vector boson) and analyse the relationships between the physical observable quantities and the LHM parameters. We will discuss the differences of the physical observable quantities in the SM and LHM, present the LHM parameter space in which there are possible new physics signals at the LHC. Meanwhile, we will suggest the technique to identify the new physics signals. Our work will provide precise theoretical foundations for the measuring of the couplings of Higgs boson with top quark (or vector boson) and finding the more strict constraits on the LHM parameters in the experiments at the LHC.