CMS实验的希格斯性质研究  

Measurements of Higgs properties from CMS

作　　者：陈国明[1] CHEN GuoMing(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院高能物理研究所,北京100049

出　　处：《中国科学：物理学、力学、天文学》2021年第9期24-33,共10页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11661141007);国家重点研发计划(编号:2018YFA0403900)资助项目。

摘　　要：LHC(Large Hadron Collider)是目前世界上能量最高的强子对撞机.CMS(Compact Muon Solenoid)是LHC上的主要实验之一,其目标就是要寻找希格斯粒子,寻找超出标准模型的其他新粒子.本文简要介绍CMS实验发现希格斯粒子和研究希格斯粒子性质的进展.目前CMS已经发现了gg H,VBF,VH和tt H等4种产生道,也看到了4轻子、两光子、WW、ττ和bb等衰变道,确立了希格斯与矢量玻色子的耦合,也确立了与第三代费米子t,b和τ的耦合,测量了希格斯的质量、宽度、衰变分支比、自旋宇称、产生截面和微分截面,在误差范围内没有发现与标准模型的明显偏离.由于现在的研究结果主要来自2016年数据,误差还比较大,所有RUN2的数据分析完成以后,结果预计会有改进.The Large Hadron Collider(LHC)exhibits the highest colliding energy in the world.The compact muon solenoid(CMS)is one of the main experiments conducted on the LHC,and its objective is to discover the Higgs boson and new particles.In this report,the discovery of the Higgs Boson and the measurements of Higgs properties using CMS RUN2 data were briefly presented.Higgs production modes—gg H,VBF,VH,and tt H—were observed using the CMS,and decay modes—ZZ to four leptons,diphotons,WW,ττ,and bb—were discovered using the CMS.Higgs coupling with vector bosons and third-generation fermions t,b,andτwere measured.Moreover,the Higgs mass,width,decay branching ratio,spin and parity,cross-section,and differential cross-section were studied.The results are consistent with those obtained using the standard model within an error range.The results are mainly obtained using 2016 data,and the errors are large.Nevertheless,the results will be improved when all RUN2 data analyses are published.

关 键 词：LHC CMS 希格斯粒子 

分 类 号：O572.214[理学—粒子物理与原子核物理]