BESIII主漂移室性能的模拟计算

Simulation calculation of the performance of BESIII main drift chamber

根据BESIII主漂移室(MDC)的设计方案,利用TRACKERR程序对主漂移室的带电径迹的5个参数ζ(Z轴方向的位移)、s(dip角的正切)、ξ(带电径迹在XY平面的投影位移)、φ(方位角)、Κ(横向动量的倒数)进行误差计算,得到了相应的误差矩阵。给出主漂移室对动量为1GeV/c的带电粒子的动量分辨率和空间分辨率。

According to the scheme in design of main drift chamber (MDC) on BESIII, the error matrix of five parameters are calculated with TRACKERR. The five parameters are ζ(the displacement in Z), s(the tangent of the dip angle, the dip angle is λ(=π/2-θ),ξ the displacement in the x-y plane perpendicular to the projection of the track direction vector onto that plane), φthe azimuth of the particle's direction), and K (the inverse of the radius of curvature). At the same time , the responding momentum resolution and space resolution of charged track in 1 GeV/c are given .