Two-particle Correlation Function Of The Composite Source Analysis Phase Angle

High energy heavy ion collision extract information on properties of nuclear matterat extreme high temperature and high density. But we can’t obtain the source of relevantinformation directly, so observing and study the identical particles to prove the exist ofQGP, and then we can get more exact message about the source. We can calculate theidentical particles correlations in the space by intensity interferometry technique and theMonte-Carlo simulation, and then through the information on properties of nuclearmatter we will get the real message about the particle-emitting sources.In this thesis, I study this problem by using the core-halo source model, which wasput forward by T.C so&&ro&&gin1996. Some people take the source as a static source, andhave the idea that the particle is frozen out immediately after production, and ignore theevolution of the source of particles, in order to simplify the calculation. This thesis isdifferent from the common idea. I syudy the source as a hydrodynamic evolution model,that means, the particle will experience a phase transition from quark-gluon plasmaphase to hadronic phase before it is frozen out.Otherwise, the particle can not be frozenout and it will go on evoluting. Obviously, it is a better way to describe the evolution ofthe particle-emitting source with the relativistic hydrodynamics theory. Two-pioncorrelation function is obtained by hydrodynamic evolution, and the geometricspreading and particle emission source is frozen out of the dynamic information throughthe detailed analysis of two-pion correlation function. There is a phase angleΦin thecorrelation function, and it is sensitive to correlation function, the study ofΦhasimportant theoretical and practical meaning, and it’s helpful to understand the messageabout the particle-emitting source.This thesis mainly has five parts as follows: The first chapter mainly introduces thedevelopment of high energy heavy-ion collisions and some related background knowledge; In the second chapter intensity interferometry technique is introduced andsummarized, and we the two particles correlations functions is obtained for chaotic andpartially coherent source; The third chapter we discuss two-pion correlation functionand the phase angleΦby using the core-halo source model, for partially coherentidentical particle-emitting sources; The fourth chapter some study of the relativistichydrodynamics is being study and the equation of state and motion is being derivedaround；The last part is the main innovations of this thesis. We disscus the Monte-Carlomethod simulate complex source according to hydrodynamics evolution to analyse thephase angle of correlation function, and come to a conclusion at last.