Simulation Research On The Yield Of Kaons In 200 GeV Au + Au Collisions

The high-energy heavy ion collision,as a method to study the Big Bang have been developing for decades for the study of the Big Bang and the universe.QGP is one of the products of high-energy heavy ion collisions,in which quarks and gluons no longer form hadrons due to asymptotically free,which is the unrestricted state.People have discovered strange particles that do not exist in nature in high-energy heavy ion collisions.As the lightest singular hadrons and the highest singular hadrons in high-energy heavy ion collisions,kaon is of great interest in this paper.Two important physical quantities related to kaons are the yield ratio of kaons to pions and the nuclear modified factor.They reflect the proporti on of strange particles generated by high-energy heavy ion collisions and the strangeness enhancement,so we study them in this paper.In this paper,data of 200 Ge V Au + Au collisions were simulated by the multiphase transport model of string melting.to analyze the effects of high-energy heavy ion collisions on the centrality,the freeze-out time and the parton scattering cross section on the ratio of kaons to pions and the nuclear modification factor.These methods are used to study the mechanism of kaons generation and strangeness enhancement in 200 Ge V Au + Au collisions.We use the AMPT model of string melting to simulate Au + Au collisions of the energy of per nucleon 200 Ge V.We studied transverse momenta distribution of pions and kaons of collisions of different centralities,fit them by Boltzmann function to get the apparent temperature,and search the relation of the apparent temperature to centrality.We get the influence of centrality on ratio of kaons to pions and the saturation of the ratio.We study the change of freeze-out time on particle numbers of pions and kaons and get the influence of the cutoff of freeze-out time on the ratio of kaons to pions.We studied the influence of parton cross section exist or not and the value of parton cross section on the yield of quarks before hadronlization,the yield of pions and kaons and the ratio of kaons to pions.We simulated the p + p collision of 200 Ge V and search the yield of pions and kaons and the ratio of kaons to pions.We studied the effect of centrality,cutoff of freeze-out time and parton cross section on nuclear modified factor.