Energy Dependence Of Light Antinuclei Production In High-energy Au-Au Collisions

Symmetry has always been a hot topic in physics.It is theoretically believed that at the beginning of the universe,the positive and the antimatter are equal,but in the real universe,the antimatter disappears.The unsolved mystery of the evolution of the universe,the asymmetry of the positive and antimatter,is one of the important subjects in modern physics.With the development and progress of experimental conditions of particle physics and high-energy physics,the observability and controllability of micro-particles have been greatly improved.It is possible to produce and study antimatter in high-energy collision experiments.In recent years,BNL/RHIC and CERN/LHC experimental groups in the United States and Europe have successively discovered,in high-energy Au-Au collisions and Pb-Pb collisions,equal-light anti-nuclei and anti-hyper-nuclei,which have profound significance for the research and understanding of antimatter Because of the huge cost of high-energy physics experiments,one of the most important research methods in particle physics is to simulate high-energy collision experiments by using theoretical models.In this paper,the background of high energy physics and antimatter,the parton-hadron transport model(PACIAE model),the phase space dynamics constrained combination model(DCPC model)and the Au-Au collision experiment are introduced.Then,using PACIAE model and DCPC model,Au-Au collision events are simulated with centroid energy(?)=11.5,14.5,19.6,27,39,62.4,130,200,800,2760,5020 GeV,and light(anti)nuclei and hyper-nuclei are generated with DCPC model.The energy dependence of light(anti)nuclear matter in high energy Au-Au collision and its corresponding properties are studied.Among them,the selected rapidity interval is-0.5 ? y ?0.5,the transverse momentum interval is pT ?:5 GeV,and the centrality is 0-10%.The results show that:(1)the yields of positive particlesp???d?3He,?3H is larger than that of negative particles(?)?(?)?(?)?(?)?(?),.and that of ordinary nuclei is larger than that of hyper-nuclei;(2)the yields of positive particles pJ???d?d?3He??3H decreases first and then increases with the increase of collision energy;the yield of negative particles(?)?(?)?(?)?(?)?(?)has been increasing,in high-energy Au-Au collisions,the production and survival of final hadrons and nuclei are strong energy dependence;(3)Ratios anti-nuclei and corresponding positive matter increases with the increase of collision energy(?),and finally approaches 1.In order to study the difficulty and energy dependence of nucleon-hyperon combination in high-energy Au-Au collisions,we simulated and calculated the coalescence parameters BA and the difference factor s3 of nucleon and hyper-nucleus combination under different collision energies.The results show that there is a strong energy dependence of the coalescence parameters BA.When the collision energy increases,BA decreases first and then increases.There is a transition point near 20 GeV,which is probably caused by the QCD critical phenomena.The difference factor s3 of?3H and 3He increases rapidly with the increase of collision energy,and tends to be saturated near 20 GeV,with a value of about 0.8,which indicates that hyper-nuclei are more difficult to form than ordinary nuclei.s3 and(?)are approximately equal,which indicates that strange to non-strange light nuclei relative production ratio are the same for particle and antiparticle.The simulation results of PACIAE+DCPC model agree well with the experimental data.