Abstract
The kaon identification is crucial for the flavor physics, and also benefits the flavor and charge reconstruction of the jets. We explore the particle identification capability for tracks with momenta ranging from 2–20 GeV/c using the dE / dx measurements in the Time Projection Chamber at the future Circular Electron-Positron Collider. Based on Monte Carlo simulation, we anticipate that an average 3.2~sigma (2.6~sigma ) K/pi separation can be achieved based on dE / dx information for an optimistic (conservative) extrapolation of the simulated performance to the final system. Time-of-flight (TOF) information from the Electromagnetic Calorimeter can provide K/pi separation around 1 GeV/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 kaon selection in inclusive hadronic Z decays with both the average efficiency and purity approaching 95% can be achieved.
Highlights
The project of building a Circular Electron-Positron Collider (CEPC) [1] in China has been proposed
We study the particle identification (PID) of kaons, pions and protons in hadronic decays at the Z pole, demonstrating that an effective kaon selection can be achieved by combining the d E/d x measurements of the Time Projection Chamber (TPC) with the time-of-flight (TOF) information provided by the Electromagnetic Calorimeter (ECAL) at the CEPC detector
We estimate the potential degradation in previous TPCs by comparing their experimental achievements with the corresponding intrinsic d E/d x resolutions obtained from Monte Carlo (MC) simulation
Summary
The project of building a Circular Electron-Positron Collider (CEPC) [1] in China has been proposed. Z bosons will be delivered at the Z pole promising refined measurements of electroweak and heavy flavor physics [3]. The d E/d x performance of the CEPC TPC is investigated based on Monte Carlo (MC) simulation. PID will play an important role in measurements of the bottom (b) and charm (c) hadron decays in heavy flavor physics. We study the PID of kaons, pions and protons in hadronic decays at the Z pole, demonstrating that an effective kaon selection can be achieved by combining the d E/d x measurements of the TPC with the time-of-flight (TOF) information provided by the Electromagnetic Calorimeter (ECAL) at the CEPC detector.
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