Precision Higgs physics at the CEPC * *Supported by the National Key Program for S&T Researh and Development (2016YFA0400400); 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

F An ,Lianliang Ma,Yifang Wang,Yuqian Wei,Gang Li,Boyang Li,Zhenwei Cui,L Z Liao ,Z Liang ,Y Bai ,L Y Shan ,Liang Li,H He ,Lian-Tao Wang ,Qiang Li,M Zhao ,F Guo ,Congqiao Li,X He ,X Lou ,X Zhao ,C M Kuo ,Y Fang ,Jun Gao,X Shi ,J Qian ,Bo Liu,J L Shi ,S.-C Hsu ,Chuansheng Chen ,M Pandurović ,H Liang ,Zhaoru Zhang,Ying Yang,Shufang Su,J Guimarães Da Costa ,Xiao-Gang He ,Dan Yu,Dayong Wang,Susmita Jyotishmati,Zhenxing Chen,Jianbei Liu,X H Mo ,Zhen Liu,Fu Cheng-Dong ,S Han ,Kaili Zhang,Shao-Feng Ge ,Jin Wang,J Guo ,R Kiuchi ,Xin Chen,Tong Li,Pei-Zhu Lai ,Jiayin Gu,Tao Han,Alex Schuy,N Rompotis ,Jifeng Hu,Manqi Ruan ,S Jin ,Y Xu ,Z Qian ,M Q Jing ,Haifeng Li,Tao Liu,H J Yang ,Y Gao ,Wei-Ming Yao ,Shu Li,B Mellado ,N Zhou

doi:10.1088/1674-1137/43/4/043002

Abstract

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.

Highlights

The historic discovery of a Higgs boson in 2012 by the ATLAS and CMS collaborations [1,2] at the LargeHadron Collider (LHC) has opened a new era in particle physics
We present the first estimates on the precision of the Higgs boson property measurements achievable at the Circular Electron Positron Collider (CEPC) and discuss implications of these measurements
CEPC detectors must be able to reconstruct and identify all key physics objects that the Higgs bosons are produced with or decay into with high efficiency, purity and accuracy

Summary

Introduction

The historic discovery of a Higgs boson in 2012 by the ATLAS and CMS collaborations [1,2] at the Large. Running at the Z pole around s = 91.2 GeV (the Z factory), CEPC will produce 1011– 1012 Z bosons These large samples will enable high precision measurements of the electroweak observables such as AbFB, Rb , the Z boson line-shape parameters, the mass and width of the W boson. CEPC detectors must be able to reconstruct and identify all key physics objects that the Higgs bosons are produced with or decay into with high efficiency, purity and accuracy. These objects include charged leptons, photons, jets, missing energy and missing momentum. Different types of reconstructed final state particles are represented in different colors

Leptons and Photons

Background processes

Background

Findings

Conclusion