Measurements of decay branching fractions of H→b■/c■/gg in associated (e^+e^-/μ^+μ^-)H production at the CEPC  

作　　者：Yu Bai Chun-Hui Chen Ya-Quan Fang Gang Li Man-Qi Ruan Jing-Yuan Shi Bo Wang Pan-Yu Kong Bo-Yang Lan Zhan-Feng Liu 白羽;陈春晖;方亚泉;李刚;阮曼奇;史静远;王博;孔攀宇;兰博扬;刘站峰(School of Physics,Southeast University,Nanjing 210096,China;Department of Physics and Astronomy,Iowa State University,Ames 50011-3160,USA;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of physics and astronomy,the University of Manchester,Oxford Rd,M139PL,UK;Department of Physics,College of Sciences,Northeastern University,Shenyang 110004,China;School of Cyber Science and Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]School of Physics,Southeast University,Nanjing 210096,China [2]Department of Physics and Astronomy,Iowa State University,Ames 50011-3160,USA [3]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [4]School of physics and astronomy,the University of Manchester,Oxford Rd,M139PL,UK [5]Department of Physics,College of Sciences,Northeastern University,Shenyang 110004,China [6]School of Cyber Science and Engineering,Southeast University,Nanjing 210096,China

出　　处：《Chinese Physics C》2020年第1期1-10,共10页中国物理C（英文版）

基　　金：Supported by the National Key Program for S&T Research and Development(2016YFA0400400);National Natural Science Foundation of China(NSFC)(11705028);Fundamental Research Funds for the Central Universities(2242015K40027 and 2242017K40018);Provincial Innovation and Entrepreneurship Training Program for Undergraduate(201710286068X);Beijing Municipal Science and Technology Commission project(Z181100004218003)

摘　　要：The high-precision measurement of Higgs boson properties is one of the primary goals of the Circular Electron Positron Collider(CEPC).The measurements ofH→b■/c■/gg decay branching fraction in the CEPC experiment is presented,considering a scenario of analysing 5000 fb-1 e^+e^-collision data with the center-of-mass energy of 250 Ge V.In this study the Higgs bosons are produced in association with a pair of leptons,dominantly mediated by the ZH production process.The statistical uncertainty of the signal cross section is estimated to be about 1%in theH→b■ final state,and approximately 5%-10%in theH→c■/gg final states.In addition,the main sources of the systematic uncertainties and their impacts to the measurements of branching fractions are discussed.This study demonstrates the potential of precise measurement of the hadronic final states of the Higgs boson decay at the CEPC,and will provide key information to understand the Yukawa couplings between the Higgs boson and quarks,which are predicted to be the origin of quarks’masses in the standard model.The high-precision measurement of Higgs boson properties is one of the primary goals of the Circular Electron Positron Collider(CEPC).The measurements ofH→bb/cc/gg decay branching fraction in the CEPC experiment is presented,considering a scenario of analysing 5000 fb-1 e^+e^-collision data with the center-of-mass energy of 250 Ge V.In this study the Higgs bosons are produced in association with a pair of leptons,dominantly mediated by the ZH production process.The statistical uncertainty of the signal cross section is estimated to be about 1%in theH→bb final state,and approximately 5%-10%in theH→cc/gg final states.In addition,the main sources of the systematic uncertainties and their impacts to the measurements of branching fractions are discussed.This study demonstrates the potential of precise measurement of the hadronic final states of the Higgs boson decay at the CEPC,and will provide key information to understand the Yukawa couplings between the Higgs boson and quarks,which are predicted to be the origin of quarks’masses in the standard model.

关 键 词：the Higgs boson CEPC branching fraction flavor tagging 

分 类 号：O572.2[理学—粒子物理与原子核物理]