Speaker
Description
Particle identification (PID) is important for the flavor physics analysis at future $e^+e^-$ colliders. Efficient $K/\pi$ separation can improve the reconstruction of exclusive heavy-flavor decays and suppress backgrounds from particle misidentification. A Ring Imaging Cherenkov (RICH) detector is therefore being studied to provide additional PID capability in the forward and backward regions of the CEPC detector.
The forward and backward RICH geometries and their track acceptance are implemented in the CEPC detector simulation. Momentum- and angular-dependent PID response matrices are applied to charged tracks to model kaon and pion identification efficiencies and misidentification probabilities. Using CEPCSW-based simulated heavy-flavor samples at the $Z$ pole, the RICH kinematic coverage, geometrical acceptance, and PID performance are evaluated, together with their impact on signal efficiency and $K/\pi$ misidentification backgrounds.
These studies provide input for optimizing the RICH design and assessing its impact on CEPC flavor-physics measurements.
