Study Of ?'???? Within The Framework Of Chiral Effective Field Theory

Quantum Chromodynamics(QCD)is the dynamic theory of strong interaction between quarks.Chiral Perturbation Theory provides us a strict and effective theoretical framework in the low energy region(E <<M?),with M? the mass of the ?.However,a strict theoretical framework in higher energy region(M??E?2Gev)is still missing.Resonance Chiral Theory provides a useful tool to study the physics in this region.In this thesis,we are going to study the decay process of ?'???? in the framework of Resonance Chiral Theory.We will introduce the relevant lagrangion and calculate the amplitude of the decay process.Then we will fit the amplitude to the latest experimental data from BESS?.Through the fits,we obtain the unknown couplings.Finally,we will analyze the fitting result and give our conclusions.