CAJ | 학술논문

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.
BESIII사례정점중건전용공구채용Kalman려파방법대물리사례정점산생적경적진행의합,사득산생재속류관내적사례정점적경적삼수화상관적오차구진득도준학적수정,종이사득차급정점적중건결과경가정학,득도경가정학적물리결과.경과수거분석검험,해공구성능가고.
For the second vertex(such as Ks,∧,(Ε))whose decay point is often in the beam pipe,the helix 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.