Study Of Dark Matter In The Extended BLMSSM

At present,a large number of experiments show that dark matter exists in the universe and accounts for 26.8%of the total universe,while baryon matter only accounts for 4.9%.If we accept the basic assumption of quantum field theory that all matter is composed of fields or particles,then it can be expected that dark matter can be observed in particle physics experiments.This motivation makes particle physicists more eager to understand the particle properties of dark matter.In theory,we have not given a very reasonable theoretical explanation There is no candidate for cold dark matter in the standard model of particle physics.So it is necessary to expand SM.BLMSSM is an extension of the standard model,which can explain some problems that the standard model cannot explain.For example,the asymmetry of positive and negative matter,the mass of neutrinos,and dark matter,etc.This paper performs theoretical calculations within the framework of BLMSSM and its extended modelBased on known dark matter properties(electrically neutral and color neutral,participating in weak interactions,maintaining stability and not prone to decay),the spin particles XLi0 and Y in the BL extended model are selected as candidates for cold dark matter.Firstly,we calculated the process χLi0χLi0(YY)→lⅠIⅠ(vⅠvⅠ)and χLi0χLi0(YY)→ vⅠvⅠ annihilation cross section σ,and then use the cosmological theoretical formula to calculate the residual abundanceΩDh2.At present,astronomical observations of the abundance of dark matter have more accurate data,the value is ΩDh2=0.0086 ± 0.0020.The numerical analysis in drew within the range of 3σ,and we discusse sensitive parameters and their effects within a reasonable parameter range.Secondly,we calculated the process χLi0q→ χLi0q scattering cross sectionsσSI and σSD at one-loop level.The direct detection experiment is to detect the signals scattered by dark matter and nucleus.With the improvement of detection technology,the restrictions on the scattering cross sections are becoming stricter.The numerical part of this paper is compared with the experimental group Panda-X,LUX and other limited results for analysis.