Distribution Properties Of Particles Produced In High Energy Collisions

By high energy heavy ion collision,people can simulate a high-temperature and high-density environment in which we can study the quark-gluon plasma(QGP)and the generation mechanism of particles.But the initial stage of the heavy-ion collision cannot be measured directly.In general,we extract the evolution information of the colliding system by analyzing the properties of observable quantities,which contain multiplicity,transverse momentum,polar and elliptic flow,angular correlation and so on.In this thesis,we will discuss the dihadron azimuthal correlations,the transverse momentum spectra and the pseudorapidity distribution of final-state particles.This thesis can be divided into three parts:Firstly,by the multisource thermal model,we detailedly show dihadron azimuthal correlations for 20-40%and 50-80%in Au-Au collisions at(?)= 200 GeV and over a centrality range from 10-15%to 70-80%in Pb-Pb collisions at(?)=2.76 TeV.The model can approximately describe the azimuthal correlations of particles produced in the collisions.The px amplitude of the corresponding source is magnified,and the source translates along the direction.The factor?x,in most cases,increases with the increase of the centrality in Pb-Pb collisions at(?)= 2.76 TeV.Secondly,we analyze transverse momentum spectra of KS0 and K*0 at midrapidity in d+Au,Cu+Cu and p + p collisions at(?)=200 GeV in the formworks of Tsallis statistics and Boltzmann statistics,respectively.Both of them can describe the transverse momentum spectra and extract the thermodynamics parameters of matter evolution in the collisions.The parameters are helpful for us to understand the thermodynamics factors of the particle production.Finally,by the multisource thermal model,we discuss the double-peak phenomena in the pseudorapidity distributions of charged particles produced in pp or pp collisions at the energy range from(?)=53 GeV to(?)=7 TeV.We find that the model can commendably describe the double-peak phenomena in the pseudorapidity distributions at the whole energy range.Furthermore,we discuss the relationship between the model parameters and the energies and give a prediction of the pseudorapidity distribution of charged particles produced in pp or pp collisions at(?)=10 TeV,13 TeV and 14 TeV.