【摘要】 本文简要描述了北京谱仪主漂移室的ｄＥ／ｄｓ粒子识别方法，给出在物理实验应用中ｄＥ／ｄｘ性能测量的主要结果．经过系统效应的软件修正和绝对的能量刻度后，对最小电离粒子（０．４—０．５ＧｅＶ／ｃ的π）大于３０次ｄＥ／ｄｘ取样的能量分辨率为７．５％．大于３σＫ／π分离的动量ｐ≤０．６５ＧｅＶ／ｃ．大于３σｅ／π分离的相应动量范围为０．２≤ｐ≤４ＧｅＶ／ｃ．更多还原

【Abstract】 The method for particle identification using dE /dx in the BES large cylindrical drift chamber has been briefly described. The performance of the particle identification using dE/dx has been given. After applying systematic effect corrections and absolute energy calibration to the dE/dx raw data, the dE/dx energy rssolution of 7.5% has been obtained for minimum ionization particles (0.4-0.5GeV /c π) in a case corresponding to more than 30 dE/dx samples per track.This results in 3σK /π separation for momentum up to 0.65GeV /c and 3σe /π separation in a momentum range of 0.2≤p≤4GeV/c.更多还原