摘要
BESⅢ事例顶点重建专用工具采用Kalman滤波方法对物理事例顶点产生的径迹进行拟合,使得产生在束流管内的事例顶点的径迹参数和相关的误差矩阵得到准确的修正,从而使得次级顶点的重建结果更加正确,得到更加精确的物理结果。经过数据分析检验,该工具性能可靠。
For the second vertex （such as Ks, A,E） whose decay point is often in the belix parameters and the error matrixes both at the zero point and at the MDC first hit layer given by the Kalman filter track fitting are not very suitable to be used to reconstruction them. The helix parameters and the error matrix at the zero points are over-corrected, and the latter are under-corrected. Developed a tool which can extrapolate inward the track from its MDC last hit layer to any required point in the beam pipe, with the careful consideration of the multiple scattering, energy loss and NUMF effects during the extrapolation.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2010年第2期194-198,共5页
Nuclear Electronics & Detection Technology
作者简介
王纪科（1982-），男，湖北人，博士研究生，从事粒子物理与原子核物理研究。
