Abstract
The Circular Electron-Positron Collider (CEPC) is a future Higgs factory proposed by the Chinese high energy physics community. It is planned to operate at a center-of-mass energy of 240–250 GeV and is expected to accumulate an integrated luminosity of 5 ab−1 over ten years of operation. At the CEPC, Higgs bosons will be dominantly produced from the ZH associated process. The vast number of Higgs events collected will enable precise studies of its properties, including Yukawa couplings to massive particles. With GEANT4-based simulation of detector effects, we study the feasibility of measuring the Higgs boson decaying into a pair of muons at the CEPC. The results with and without information from the Z boson decay products are provided, showing that a signal significance of over 10 standard deviations can be achieved and the H-μ-μ coupling can be measured within 10% accuracy.
Highlights
The discovery of the Higgs-like boson completes the particle table of the Standard Model (SM) of particle physics
The Circular Electron-Positron Collider (CEPC) [7], is designed to run around 240 ∼ 250 GeV with an instantaneous luminosity of 2 × 1034 cm−2 s−1, and will deliver 5 ab−1 of integrated luminosity with ten years of running
Considering a center mass energy of 250 GeV and an integrated luminosity of 250 fb−1, the signal is dominated by the Higgs-strahlung from a Z boson and the signal significances for the sub-processes with Z boson decays into ννand qqare found to be 1.8 and 1.1 σ, respectively [14]
Summary
The discovery of the Higgs-like boson completes the particle table of the Standard Model (SM) of particle physics. The event rate with Higgs couplings to the first and second generation of massive fermions can be very small, making them difficult to measure at the LHC. Considering a center mass energy of 250 GeV and an integrated luminosity of 250 fb−1, the signal is dominated by the Higgs-strahlung from a Z boson and the signal significances for the sub-processes with Z boson decays into ννand qqare found to be 1.8 and 1.1 σ, respectively [14]. The first case maximally exploited the statistics of the produced H → μ+μ− events and the second category takes advantage of the major part of the decay kinematics For both cases, we first perform a cutbased analysis and improve the measurement using a Boosted Decision Tree (BDT) technique.
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