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The kaon identification is crucial for the flavor physics, and also benefitsthe flavor and charge reconstruction of the jets. We explore the particleidentification capability for tracks with momenta ranging from 2-20 GeV/c usingthe $dE/dx$ measurements in the Time Projection Chamber at the future CircularElectron-Positron Collider. Based on Monte Carlo simulation, we anticipate thatan average $3.2~\sigma$ ($2.6~\sigma$) $K/\pi$ separation can be achieved basedon $dE/dx$ information for an optimistic (conservative) extrapolation of thesimulated performance to the final system. Time-of-flight (TOF) informationfrom the Electromagnetic Calorimeter can provide $K/\pi$ separation around 1GeV/c and reduce the $K/p$ mis-identification rate. By combining the $dE/dx$and TOF information, we estimate that in the optimistic scenario a kaonselection in inclusive hadronic $Z$ decays with both the average efficiency andpurity approaching 95\% can be achieved.

Performance study of particle identification at the CEPC using TPC $dE/dx$ information