Precision Higgs Physics at CEPC

TL;DR

This paper evaluates the potential of the CEPC, a proposed electron-positron collider in China, to precisely measure Higgs boson properties and explore new physics beyond the LHC's capabilities.

Contribution

It provides the first estimates of Higgs property measurement precision at the CEPC and discusses the implications for particle physics research.

Findings

High-precision Higgs measurements are achievable at CEPC.

Potential to probe new physics beyond current collider capabilities.

Enhanced understanding of Higgs boson properties and interactions.

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.