Speaker
Description
Our research focuses on investigating the electroweak couplings of the top quark at the Circular Electron Positron Collider (CEPC) for semileptonic top pair production at a center-of-mass energy of 360 GeV. This energy is close to twice the top quark mass, which enhances the measurement precision of the top quark mass. This study utilizes both CEPC-Full and CEPC-Fast simulations.
The CEPC provides an ideal environment for measuring these couplings, and it is expected to yield higher precision measurements than those achieved at the Large Hadron Collider (LHC). The data were generated and passed through CEPC-Soft reconstruction and simulations softwares.
Our findings indicate that the top quark mass can be reconstructed, resulting in a value of 172 GeV with a reasonable standard deviation, without including systematic uncertainties. Additionally, we conducted a background study that achieved high suppression rates, nearly eliminating other Standard Model backgrounds.
The measurement of forward-backward asymmetry will enable us to extract the photon and Z0 couplings of the top quark, which can be analyzed through the angle of the decay lepton in the semileptonic decays of the top pair in the top quark's rest frame.
