Expected H→μ^(+)μ^(-)measurement precision with e^(+)e^(-)→Z(qq)H production at the CEPC  

作　　者：Qi Liu Kunlin Ran Yanping Huang Gang Li Manqi Ruan Shan Jin Liang Sun 刘淇;冉坤林;黄燕萍;李刚;阮曼奇;金山;孙亮(School of Physics and Technology,Wuhan University,Wuhan 430072,China;Institute of High Energy Physics,Beijing 100049,China;School of Physics,Nanjing University,Nanjing 210093,China)

机构地区：[1]School of Physics and Technology,Wuhan University,Wuhan 430072,China [2]Institute of High Energy Physics,Beijing 100049,China [3]School of Physics,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Physics C》2022年第9期1-9,共9页中国物理C（英文版）

基　　金：the Innovative Research Program of IHEP(E2545AU210);CAS Center for Excellence in Particle Physics;Yifang Wang’s Science Studio of the Ten Thousand Talents Project;the CAS/SAFEA International Partnership Program for Creative Research Teams(H751S018S5);IHEP Innovation Grant(Y4545170Y2);Key Research Program of Frontier Sciences,CAS(XQYZDY-SSW-SLH002);Chinese Academy of Science Special Grant for Large Scientific Project(113111KYSB20170005);the National Natural Science Foundation of China(11675202);the National 1000 Talents Program of China;Fermi Research Alliance,LLC(DE-AC02-07CH11359);the NSF(PHY1620074);the Maryland Center for Fundamental Physics(MCFP);Tsinghua University Initiative Scientific Research Program;the Beijing Municipal Science and Technology Commission project(Z181100004218003)。

摘　　要：A search for the dimuon decay of the Standard Model Higgs boson is performed using Monte Carlo simulated events to mimic data corresponding to an integrated luminosity of 5.6 ab^(-1)collected with the Circular Electron-Positron Collider detector in e^(+)e^(-)collisions at√s=240 GeV.This study investigates the e^(+)e^(-)→ZH,Z→qq,H→μ^(+)μ^(-)process,and the expected significance considering only the statistical uncertainty in the data for a background-only hypothesis for a Higgs boson with a mass of 125 GeV is found to be 6.1σ,corresponding to a precision of 19%.The systematic impacts from the background Monte Carlo statistical fluctuations are estimated to be negligible.Moreover,the dependence of the measurement accuracy on the muon momentum resolution of the CEPC detector is investigated.It is found that the muon momentum resolution must be better than 204 MeV to discover the H→μμprocess at the nominal integrated luminosity,If the resolution is 100%worse than the designed parameter,the integrated luminosity must be greater than 7.2 ab^(-1)to reach 5σsignificance.

关 键 词：CEPC HIGGS Yukawa Coupling 

分 类 号：O572.2[理学—粒子物理与原子核物理]