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
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
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