Monte Carlo study of particle identification at the CEPC using TPC dE / dx information
Monte Carlo study of particle identification at the CEPC using TPC dE / dx information
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DOI：
10.1140/epjc/s10052-018-5803-3
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
F. An;F. An;S. Prell;Chunhui Chen;J. Cochran;X. Lou;X. Lou;M. Ruan
中科院分区：
文献类型：
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作者：
F. An;F. An;S. Prell;Chunhui Chen;J. Cochran;X. Lou;X. Lou;M. Ruan
K介子的确定对射流的味道物理研究至关重要，同时也有利于射流的味道和电荷重构。本文利用在未来的环形正负电子对撞机（Circular Electron-Positron Collider）上进行的时间投影室（Time Projection Chamber）中的dE/dx测量，探讨了动量范围为2-20 GeV/c的径迹的粒子识别能力。基于Monte Carlo模拟，我们预计可以根据dE/dx信息实现平均（）分离，以便将模拟性能乐观（保守）外推到最终系统。从电磁量热计获得的飞行时间（TOF）信息可以提供大约1GeV/c的分离，并降低K/pm的错误识别率。通过结合dE/dx和TOF信息，我们估计，在乐观的情况下，在包容强子Z衰变的平均效率和纯度接近95%的K介子选择可以实现。
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 thedE/dxmeasurements in the Time Projection Chamber at the future Circular Electron-Positron Collider. Based on Monte Carlo simulation, we anticipate that an average()separation can be achieved based ondE/dxinformation for an optimistic (conservative) extrapolation of the simulated performance to the final system. Time-of-flight (TOF) information from the Electromagnetic Calorimeter can provideseparation around 1 GeV/c and reduce theK/pmis-identification rate. By combining thedE/dxand TOF information, we estimate that in the optimistic scenario a kaon selection in inclusive hadronicZdecays with both the average efficiency and purity approaching 95% can be achieved.