L3中心径迹室顶点位置分辨的改进

Improvements of The L3 TEC Track Resolution at Vertex

运用两种方法对Ｌ３中心任迹漂移室的顶点位置分辨进行了改进，一种是利用高能量分辨的电子和高动量分辨的μ子测量，限定轻子径迹的曲率半径，对径迹进行重新拟合；另一种是对中心径迹室每半边单元的径迹零位置位移进行校正．结合两种改进方法将轻子的顶点位置分辨由原来的１３７μｍ提高到６０μｍ．

Two methods are used to improve the L3 TEC resolution at track vertex.First,refit the lepton tracks by constrained curvature from high precision measurements on electron energy and muon momenta. Second, correct the average value of track offsets in each half sector of TEC.Combined methods improve the lepton track resolution at vertex from 137μm to 60μm.