The discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy physics.The Higgs boson will be the subject of extensive studies of th...The discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy physics.The Higgs boson will be the subject of extensive studies of the ongoing LHC program.At the same time,lepton collider based Higgs factories have been proposed as a possible next step beyond the LHC,with its main goal to precisely measure the properties of the Higgs boson and probe potential new physics associated with the Higgs boson.The Circular Electron Positron Collider(CEPC)is one of such proposed Higgs factories.The CEPC is an e^+e^- circular collider proposed by and to be hosted in China.Located in a tunnel of approximately 100 km in circumference,it will operate at a center-of-mass energy of 240 GeV as the Higgs factory.In this paper,we present the first estimates on the precision of the Higgs boson property measurements achievable at the CEPC and discuss implications of these measurements.展开更多
The Circular Electron Positron Collider(CEPC),proposed as a future Higgs boson factory,will operate at a center-of-mass energy of 240 GeV and will accumulate 5.6 ab−1 of integrated luminosity in 7 years.In this study,...The Circular Electron Positron Collider(CEPC),proposed as a future Higgs boson factory,will operate at a center-of-mass energy of 240 GeV and will accumulate 5.6 ab−1 of integrated luminosity in 7 years.In this study,we estimate the upper limit of BR(H→inv)for three independent channels,including two leptonic channels and one hadronic channel,at the CEPC.Based on the full simulation analysis,the upper limit of BR(H→inv)could reach 0.26%at the 95%confidence level.In the Stand Model(SM),the Higgs boson can only decay invisibly via H→ZZ∗→νν¯νν¯,so any evidence of invisible Higgs decays that exceed BR(H→inv)of the SM will indicate a phenomenon that is beyond the SM(BSM).The invariant mass resolution of the visible hadronic decay system ZH(Z→qq,H→inv)is simulated,and the physics requirement at the CEPC detector for reaching this is given.展开更多
基金Supported by the National Key Program for S&T Researh and Development(2016YFA0400400)CAS Center for Excellence in Particle Physics+12 种基金Yifang Wang’s Science Studio of the Ten Thousand Talents Projectthe 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 Hundred Talent Programs of Chinese Academy of Science(Y3515540U1)the National 1000 Talents Program of ChinaFermi Research Alliance,LLC(DE-AC02-07CH11359)the NSF(PHY1620074)by the Maryland Center for Fundamental Physics(MCFP)Tsinghua University Initiative Scientific Research Programthe Beijing Municipal Science and Technology Commission project(Z181100004218003)
文摘The discovery of the Higgs boson with its mass around 125 GeV by the ATLAS and CMS Collaborations marked the beginning of a new era in high energy physics.The Higgs boson will be the subject of extensive studies of the ongoing LHC program.At the same time,lepton collider based Higgs factories have been proposed as a possible next step beyond the LHC,with its main goal to precisely measure the properties of the Higgs boson and probe potential new physics associated with the Higgs boson.The Circular Electron Positron Collider(CEPC)is one of such proposed Higgs factories.The CEPC is an e^+e^- circular collider proposed by and to be hosted in China.Located in a tunnel of approximately 100 km in circumference,it will operate at a center-of-mass energy of 240 GeV as the Higgs factory.In this paper,we present the first estimates on the precision of the Higgs boson property measurements achievable at the CEPC and discuss implications of these measurements.
基金Supported in part by the IHEP Innovation Grant(Y4545170Y2)Chinese Academy of Science Focused Science Grant(QYZDY-SSW-SLH002)+1 种基金Chinese Academy of Science Special Grant for Large Scientific Projects(113111KYSB20170005)Beijing Municipal Science&Technology Commission(Z181100004218003,Z191100007219010)。
文摘The Circular Electron Positron Collider(CEPC),proposed as a future Higgs boson factory,will operate at a center-of-mass energy of 240 GeV and will accumulate 5.6 ab−1 of integrated luminosity in 7 years.In this study,we estimate the upper limit of BR(H→inv)for three independent channels,including two leptonic channels and one hadronic channel,at the CEPC.Based on the full simulation analysis,the upper limit of BR(H→inv)could reach 0.26%at the 95%confidence level.In the Stand Model(SM),the Higgs boson can only decay invisibly via H→ZZ∗→νν¯νν¯,so any evidence of invisible Higgs decays that exceed BR(H→inv)of the SM will indicate a phenomenon that is beyond the SM(BSM).The invariant mass resolution of the visible hadronic decay system ZH(Z→qq,H→inv)is simulated,and the physics requirement at the CEPC detector for reaching this is given.
