高能对撞机上希格斯粒子性质的精确研究及新物理探索

在实验上发现希格斯（Higgs）粒子之后，精确检验其性质进而寻找新物理，就成为当前粒子物理学界的重要课题。通过对高能对撞机上Higgs伴随产生过程和新物理模型重Higgs的衰变过程进行精确研究，来探索可能的新物理效应，是完成此课题的有效途径。本项目选取了一些重要的Higgs伴随产生过程和重Higgs粒子的衰变过程作为研究内容。为满足高能对撞实验对理论预言的高精度需求，本项目将在新物理模型下对这些过程进行精确研究，给出Higgs伴随产生过程完整的次领头阶修正，以及重Higgs粒子衰变过程的双圈QCD修正。根据不同对撞模式对撞机的特点，本项目将对应选取有利的Higgs衰变道进行本底分析，为实验测量提供可行的实验方案。本项目的开展，将为高能对撞实验精确检验Higgs的性质提供精确的理论依据。双圈QCD修正是当前量子场论计算领域的难点，本项目希望攻克该难点，为高阶辐射修正计算的发展做出贡献。

Since the discovery of the Higgs boson, it becomes an important topic in modern particle physics to test Higgs boson property precisely and search for New Physics. It is an effective way to accomplish this topic that searching for the clues of New Physics by precision studies of Higgs boson associate production at high energy colliders and New Physics heavy Higgs decay. This project selects some important Higgs boson associate production and heavy Higgs decay processes as the research contents. In order to meet the high precision demand of high energy colliders experiments for theoretical predictions, this project will study these processes precisely in New Physics models, present complete Next-to-Leading order (NLO) corrections to Higgs boson associate production processes and two-loop QCD corrections to the heavy Higgs decay processes. According to the characteristics of colliders with different collision modes, this project will select favorable Higgs decay channels for background analysis, and provide the feasible experimental schemes for experimental measurements. This project will provide precise theoretical basis for precision testing of Higgs boson properties in high energy colliders experiments. The studies of two-loop QCD corrections is difficult in Quantum Field Theory, this project hopes to overcome this difficulty and make contributions to the development of high order corrections.