Measurements of decay branching fractions of
in associated
production at the CEPC Supported by the National Key Program for S&T Research and Development (2016YFA0400400), National Natural Science Foundation of China (NSFC) (11705028), Fundamental Research Funds for the Central Universities (2242015K40027 and 2242017K40018), Provincial Innovation and Entrepreneurship Training Program for Undergraduate (201710286068X), and Beijing Municipal Science and Technology Commission project (Z181100004218003)
Yu Bai (
School of Physics, Southeast University, Nanjing 210096, China); Chun-Hui Chen (
Department of Physics and Astronomy, Iowa State University, Ames 50011-3160, USA); Ya-Quan Fang (
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China); Gang Li (
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China); Man-Qi Ruan (
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China); et al - Show all 10 authors
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.
