The Ratio K/? In RHIC Beam Energy Scan Region

High energy heavy ion collisions is mainly to study the properties of extremely high temperature,high pressure and high density nuclear matter produced during nuclear nucleus collisions.At present,we can not directly measure the properties of extreme nuclear matter under the laboratory conditions,only through the indirect measurements of the final observable measurements,so the final observable measurement is particularly important for the study of the properties of nuclear materials.The phenomenon of strangeness enhancement can be used as a signal of the quark gluon plasma produced during nuclear nucleus collisions,so the study of strangeness is one of the important research directions after the high energy collision experiment data is run out.The strangeness is a sensitive probe that can be used to detect the deconfinement state.The K/? ratio is considered to be a useful observable measurement that can detect strangeness enhancement.Therefore,this paper mainly studies K/? ratio on the RHIC beam energy scan region and studies the influence of the parton cascade and hadron scattering for K/? ratio.we apply A Multi-Phase Transport model(AMPT)to simulate the Au+Au central collisions at the collision energy of 7.7,9.2,11.5,14.5 and 19.6GeV.According to our research needs,we change the value of the parton screening mass in the string melting AMPT model to get some part of parton reaction cross-section that we need,or to control the hadronic scattering by changing the time step.When the beam energy is 14.5GeV Spatial coordinate distribution of the final state K,?mesons are preliminarily analyzed by using ROOT software,It is confirmed that we simulate the central collision,and provide the truncation basis for the RT distribution.Then the effects of parton cascade and hadron scattering on the time evolution of the final state K,? meson,and effects of parton cascade and hadron scattering on the multinumber distribution and the particle transverse momentum spectrum are also analyzed.Finally,The final state K,? meson yields in different collisions are extracted by using ROOT software to study the effects of parton cascade and hadron scattering on the lower collision energies.