The Circular Electron-Positron Collider (CEPC) can be operated not only as a Higgs factory but also as a Z-boson factory, offering great opportunities for flavor physics studies where Particle Identification (PID) is critical. The baseline detector of the CEPC could record TOF and dE/dx information that can be used to distinguish particles of different species. We quantify the physics requirements and detector performance using physics benchmark analyzes with full simulation. We conclude that at the benchmark TOF performance of 50ps, the dE/dx resolution should be better than 3% for incident particles in the barrel region with a relevant energy larger than 2GeV/c. This performance leads to an efficiency/purity of K± identification 97%/96%, D0→π+K− reconstruction 68.19%/89.05%, and ϕ→K+K− reconstruction 82.26%/77.70%, providing solid support for relevant CEPC flavor physics measurements.
@article{arxiv.2209.14486,
title = {Requirement analysis for dE/dx measurement and PID performance at the CEPC baseline detector},
author = {Yongfeng Zhu and Shanzhen Chen and Hanhua Cui and Manqi Ruan},
journal= {arXiv preprint arXiv:2209.14486},
year = {2022}
}