Studying Of Different Form Factor In PWA

In high energy experiment we measure the distribution of moment and energy and angled distribution of the outgoing particles that were produced by particle's collisions in different type of accelerators. In theory we fit and analysis the data that observed from the experiment to research the properties (mass,decay width,spin and so on) of particles and find new particles or resonances.It is necessary to calculate the resolution formula of cross section to fit experiment,but the formula always depends on special physical model. Indeed it is difficult to give out an available result using some physical models,for example Quantum Chromodynamics problem mostly can't expand using perturbation approximations.To avoid depending on special physical model and find out a universal result,one can only uses dynamical analysis to get fitting formula. PWA is just a succinct and available method that doesn't depend on special model. There are two types of PWA method,the non-relativistic PAW method and the relativistic PAW method which developed from 40's and 50's of twenty century (including covariant tensor PWA method and Helicities amplitude analysis method). The relativistic covariant full amplitude PWA method is a common way to search for new states in current. It takes advantages of modern computer to fit all the experimental information,hence a very powerful PWA method. In this thesis,we use this method to analysis hadrons JAPdecay model JAP->(pTT-Tr+and J P radioactive decay model Based on the PWA amplitude,we received mass distribution of two outgoing pious and angle distribution of the outgoing particles using the CERN program. Finally we compared tow different form factors (barrier factors and Gauss factor) which were always used the calculating of PWA amplitude.This thesis is divided into six chapters. The first two chapter is about some basic acknowledgement of particle physic pertinent to our studying and summaries the researching state of JAP decay in finding glueball,hybrids,multiple-quake state and the PWA method. The third chapter goes into particulars of how to use Feyman rules to write out invariant amplitudes. The fourth chapter lists out partial amplitude of using the PWA method described in chapter four,then we use CERN programs to calculate out and plot angular distributions and mass distribution,finally we compare the influence of different form factors. The fifth chapter adopts the same process of the third chapter to analysis the decay The last chapter summaries our work and prospects further studying fields based on this thesis.