Chinese Physics C, Volume. 44, Issue 1, (2020)
Measurements of decay branching fractions of in associated production at the CEPC *
Yu Bai1、*, Chun-Hui Chen1、*, Ya-Quan Fang1、*, Gang Li1、*, Man-Qi Ruan1、*, Jing-Yuan Shi1,2, Bo Wang1,2, Pan-Yu Kong1,2, Bo-Yang Lan1, and Zhan-Feng Liu1
Author Affiliations
1Department of Physics and Astronomy, Iowa State University2Department of Physics and Astronomy, Iowa State University, Ames 50011-3160, USA1Institute of High Energy Physics, Chinese Academy of Sciences3Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China1School of Physics, Southeast University1School of Physics, Southeast University, Nanjing 210096, China2Department of Physics, College of Sciences, Northeastern University5Department of Physics, College of Sciences, Northeastern University, Shenyang 110004, China2School of Cyber Science and Engineering, Southeast University6School of Cyber Science and Engineering, Southeast University, Nanjing 210096, China2School of physics and astronomy, the University of Manchester4School of physics and astronomy, the University of Manchester, Oxford Rd, M13 9PL, UKshow less
The high-precision measurement of Higgs boson properties is one of the primary goals of the Circular Electron Positron Collider (CEPC). The measurements of decay branching fraction in the CEPC experiment is presented, considering a scenario of analysing 5000 fb-1 collision data with the center-of-mass energy of 250 GeV. In this study the Higgs bosons are produced in association with a pair of leptons, dominantly mediated by the ZH production process. The statistical uncertainty of the signal cross section is estimated to be about 1% in the final state, and approximately 5%-10% in the final states. In addition, the main sources of the systematic uncertainties and their impacts to the measurements of branching fractions are discussed. This study demonstrates the potential of precise measurement of the hadronic final states of the Higgs boson decay at the CEPC, and will provide key information to understand the Yukawa couplings between the Higgs boson and quarks, which are predicted to be the origin of quarks’ masses in the standard model.
