实验粒子物理学家。中国科学技术大学教授。1988年在中国科学技术大学获博士学位。此后在中科院高能物理研究所、瑞士联邦苏黎世高等工业大学（ETHZ）做博士后和研究助理。1997年任中科院高能物理研究所北京谱仪量能器组组长，物理一室主任，北京谱仪实验负责人。2001年至2008年在美国密歇根大学做访问教授和研究员，从事强子对撞机上的D0和ATLAS实验。2008年任中国科学技术大学教授。主要从事大型强子对碰机上的ATLAS实验和北京正负电子对碰机上的北京谱仪实验。研究兴趣为Higgs粒子的性质与新物理寻找。

长期从事粒子物理实验研究，在探测器研制、建造、运行，物理分析以及组织领导大型国际合作方面有丰富的经验。在ETHZ工作期间，与合作者建造了特殊结构的弯晶谱仪，精确测量了奇异π氢、π氘原子因强相互作用引起的基态能级的偏移并首次观测到其谱线展宽。结果对确定π-核子系统的耦合常数，检验和发展手征微扰理论至关重要。通过对飞行π介子束的测量，否定了KARMEN实验报道的发现重中性粒子的结果。在北京谱仪上直接领导和主持进行了2-5GeV能区R值的精确测量，其结果对由弱电数据间接寻找Higgs粒子及其质量拟合以及精确检验标准模型起到极其重要的作用，并受到国际高能物理界的高度赞赏和重视；R值的结果被国际粒子数据手册收录且被写入教科书。在大型强子对碰机上的ATLAS实验中，为精密缪子谱仪的建造做出了重要贡献, 并对双玻色子物理及Higgs粒子的发现做出了直接贡献。

 1998年入选国家基金委杰出青年。2001年获中国科学院杰出青年科学家奖，2003年获北京市科学技术一等奖，2005年获国家自然科学二等奖，2014年获何梁何利物理学奖。2012年入选美国物理学会会士。2013年入选中国科学院院士。

Professor of physics. Ph.D. of 1988 at the University of Science and Technology of China (USTC). Since then worked as post doctor and research associate at Institute of High Energy Physics (IHEP) of Chinese Academy of Sciences (CAS) and the Swiss Federal Institute of Technology, Zurich (ETHZ) for BEijing Spectrometer (BES) at Beijing Electron Positron Collider (BEPC) and the experiment of pionic atoms. Became the head of physics division of IHEP and the spokesperson of the BES Collaboration in 1997. Visiting professor and research scientist of the University of Michigan from 2001 to 2009 for the D0 experiment at Tevatron and ATLAS experiment at the Large Hadron Collider (LHC). In 2009 appointed as professor of physics at USTC and director of the Center for Particle Science and Technology. Major research interest is the study of the property of the Higgs boson and search for new physics, including dark matter and exotics with ATLAS experiment at LHC, and the technology development of the particle detection.  

Major progress achieved are (1) precision measurement of the strong energy shift and broadening of the ground state of the pionic hydrogen and deuterium; (2) search for the heavy neutral particle from the pion decays in flight; (3) measurement of the total hadron production cross section of the e⁺e^- annihilation in the energy region between 2 and 5 GeV; (4) construction of the position monitoring drift tube chamber of the Muon Spectrometer of the ATLAS detector, and physics with diboson, including measurement of the production cross section of the WW, ZZ, search for Higgs and dark matter from WW and ZZ final states.

Awarded by (1) National Science Foundation of China for Outstanding Youth Program in 1998; (2) Outstanding Young Scientist of CAS in 2001; (3) Prize of Science and Technology of Beijing in 2003; (4) National Prize of Nature Science in 2005; (5) Heliang-Heli Prize in Physics of 2014.      

Elected as fellow of American Physics Society in 2012 and Academician of CAS in 2013.