基于RooFit框架的分波分析软件研究

The Development of Partial Wave Analysis Software Based on the RooFit Framework

介绍了基于RooFit框架的一种新的分波分析实现方法。利用RooFit的PDF处理能力,开发出适用于BESIII物理分析的分波分析软件。应用该软件,方便地构造了物理衰变过程的几率密度函数(PDF)。该软件为分波分析提供多种方便的功能,例如多道同时拟合、本底的扣除以及拟合出参数和比份的统计误差。

This paper introduces a new implementation of partial wave analysis based on the RooFit framework. Using the capability of RooFit to handle the PDF, we develop a partial wave analysis software for BESIII phys- ics. With this software, we can conveniently construct the probability density function （PDF） of the corre- sponding physical process. This software provides various handy functionality of PWA, such as simultaneous fit of multi channels, background subtraction, calculation of the fitting error of resonance parameters and fit frac- tion.