Two-Pion Interferometry For The Particle-Emitting Sources In Ampt Model

How to extract the size of space dominated by the matter that existence is justseveral fm/c is interesting to people. people also can get the dynamics of source(suchas collective expansion velocity and temperature) by analyzing the KT dependence ofHBT radius. In this thesis, I will give the detail of theoretical method of 2Ï€interferom-etry, then use 2Ï€interferometry to analyze HBT radius for the particle-emiting sourcein AMPT model The results show a trend that HBT radius decrease as transverse mo-mentum of particle increase. Parton evolution is also believed as a key factor thatmakes a important impact on HBT radius. This article analyzes the effect of partonevolution to HBT radius through changing parton cross section. hadron evolution, laststage before particles freeze out from emission source, is crucial to HBT radius. Thisarticle analyzes the properties of HBT radius when hadron evolution is excluded. Ialso give a discussion of centrality dependence of HBT radius and use Glauber modelto explain it. A topic that how to get the source temperature and average transverse?ow trough several kinds of particles'transverse mass spectrum is included at last.