检验理论模型、为新理论发展提供数据支持是粒子物理实验中的重要课题之一。本课题将利用北京谱仪获取的psi(3770)数据测量D->K pi e nv衰变中的相互作用结构，检验格点量子色动力学和手征自发破缺机制。用同位旋模型构造衰变振幅，利用最大似然拟合的方法，通过对D+->K-pi+e+nv、D+->Ks pi0e+nv、D0->Ks pi-e+nv以及D0->K-pi0e+nv这4个过程过程的研究，测量中间共振态的形状因子以及其之间的相移和相对分支比，从而理解Kpi相互作用机制。

This project aims to verify theoretical models and support new data for new physics in particle physics experiment. Based on psi(3770) data of BESIII, the measurement of interactions structure of D->K pi e nv decay will verify lattice QCD and chiral perturbation theory. Using isobar model and maximum likelihood method, the measurements of structures of interactions, form factors and phase shifts of D+->K-pi+e+nv、D+->Ks pi0e+nv、D0->Ks pi-e+nv and D0->K-pi0e+nv decays will be performed, which is helpful to understand the interaction of Kpi.