北京谱仪Ⅲ事例筛选的主漂移室快速重建算法实现

Fast reconstruction algorithm in main drift chamber for the BESIII event filter.

陈述了在北京正负电子对撞机重大升级改造工程(BEPCⅡ)中一个应用于北京谱仪III(BESIII)主漂移室(MDC)事例筛选的快速重建算法.为了实现此算法并保证算法的可扩展性,利用C++编写了MdcLutHough模式识别程序并展示出应用此程序进行径迹识别的效果,其径迹拟合的效率大约为95%,粒子横动量PT的分辨率则小于5%.该快速重建算法将在BESIII的计算机数据重建中发挥其应用价值.

The purpose of this paper is to present a fast reconstruction algorithm in the Beijing Electron Positron Collider upgrade（BEPC Ⅱ ）, which can be used in the Main Drift Chamber （MDC） event filter at Beijing Spectrometer Ⅲ （BESⅢ） . For the algorithm development, the program of pattern recognition MdcLutHough was written in C＋＋ , which helps to realize that algorithm. The results obtained by that algorithm showed that the track fitting efficiency was about 95% and the resolution for the particle transverse momentum PT was less than 5%. This fast reconstruction algorithm will play role in the BESIII computing data reconstruction.