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

作     者：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 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

作者机构：School of PhysicsSoutheast UniversityNanjing 210096China Department of Physics and AstronomyIowa State UniversityAmes 50011-3160USA Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of physics and astronomythe University of ManchesterOxford RdM139PLUK Department of PhysicsCollege of SciencesNortheastern UniversityShenyang 110004China School of Cyber Science and EngineeringSoutheast UniversityNanjing 210096China 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2020年第44卷第1期

页      面：1-10页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

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) 

主　　题：the Higgs boson CEPC branching fraction flavor tagging 

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→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.