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首次实现了将北京谱仪 -Ⅱ (BESⅡ )的两种探测器 (主漂移室和顶点探测器 )中的带电径迹联合起来一起重建 ,并给出了相应的离线刻度方法 .经过真实数据和蒙特卡罗样本的检查 ,联合重建后BESⅡ带电粒子的动量分辨提高了 2 0 %以上 ,结果证明本文采用的联合重建和离线刻度方法是有效的 .
For the first time, it is the first time to reconstruct the charged traces in two kinds of detectors (main drift chamber and vertex detector) of Beijing Spectrometer-Ⅱ (BESⅡ) and give the corresponding offline calibration method.After the real data and Monte Carlo samples, the momentum resolution of BES Ⅱ charged particles increased by more than 20% after the joint reconstruction. The results show that the joint reconstruction and offline calibration methods used in this paper are effective.