Transverse Momentum Distribution And Nuclear Modification Factor Of Different Particles In High-energy Collisions

High-energy collision experiments play an important role in particle physics.The collision can produce a lot of observable particles,which carry a lot of information about the strongly coupled matter known as quark-gluon plasma(QGP).The transverse momentum distribution of these particles can be used to analyze the distribution characteristics of particles and the nuclear modification factor can be used to study the energy loss and kinetic effects of the particles.By studying the transverse momentum distribution and the nuclear modification factor,the evolution information of the collision system and the particle generation mechanism can be obtained.My work may be consisted of two parts.In the first part,the transverse momentum spectrum of the parties is calculated by the multi-source thermal model.Based on the result,by Tsallis non-extensive statistical method,the nuclear modification factor is derived in the relaxation time approximation.For different non-extensive parameters,the change of the nuclear modification factor with the transverse momentum is found.The dynamic freezing temperature and non-equilibrium degree are extracted by Tsallis statistics.By analyzing the transverse momentum distribution and the nuclear modification factor in Xe-Xe collision at(?)=5.44 TeV,the evolution of the collision system and the mechanism of particle generation are discussed.By comparing with the data results,we investigate the thermodynamic parameters such as Tpp,qpp,T,and q,which directly reflect the thermodynamic information carried by the particles.In the second part,Boltzmann statistics is used to study the transverse momentum distribution of the particles in different kinds of collisions and is compared with Tsallis statistics.The freezing temperature and the transverse flow velocity of the system are given by Boltzmann statistics.Applying the statistical method to the study of the particle distribution in high-energy collisions,we discuss the transverse momentum distribution of particles in Au-Au,d-Au and collisions at(?)=200 GeV.Furthermore,we analyze the transverse momentum distribution of the particles in Xe-Xecollisions at(?)=5.44 TeV and Pb-Pb collisions at(?)=2.76 TeV.The model results and experimental data are compared and discussed in detail.By the statistical analysis of the transverse momentum distribution,the thermodynamic parameters T0,q,and ?T of different collision systems are obtained,and the thermodynamic quantities are described quantitatively.