| Since the birth of human civilization,the exploration of the basic structure of ma-terial has been constantly developing with the progress of human civilization.From molecules to atoms,from atoms to nuclei,from nuclei to protons and neutrons in the nucleus,from protons and neutrons to other hadrons(including baryons and mesons),to current quarks,gluons and lepton,the development history of particle physics can also be said to a certain extent the discovery history of various elementary particles.Strong interaction,weak interaction,electromagnetic interaction and gravitational interactions are four kinds of interactions in nature.Strong interactions are the forces acting on hadrons.Quantum chromodynamics(QCD)describes strong interactions,The basic theory of quantum chromodynamics is that quarks and gluons are bound together by strong interactions to form hadrons.Due to the color confinement effect,quarks and gluons cannot be observed,so the smallest basic unit we can observe at present still is hadron.Hadron physics is our current powerful tool for exploring the micro world.By the early 1960s,people had discovered more than 200 hadrons such as π,ρ,ω,and the number of elementary particles that make up the physical world cannot be so huge.Later,in 1964,American physicist M.Gell-Mann and G.Zweig,who worked at the European Nuclear Center,proposed the use of quarks as the basic particles of hadrons.In the traditional quark model,hadrons are composed of elementary particle quarks,mesons are composed of quark-antiquark pairs(qq),and baryons are composed of three quarks(qqq).With the substantial improvement of experimental technology and the progress of theoretical research,experimental physicists discovered many baryon excited states through the πN andKN scattering experiments.After the quark model has achieved great success in explaining the classification of hadrons and ground state properties,people have also tried to enrich some dynamic mechanisms in the original quark model so that it can explain more experimental data,especially looking forward to giving consideration to a perfect explanation of the various properties of baryon excited states.This paper mainly uses the effective Lagrangian method to theoretically study the properties of the particle Λ(1600)during the near-threshold reaction of K-p→ Λπ0π0.We introduced the contribution of particle Λ(1670)to the reaction process.Our experi-mental data is eight sets of experimental data released by the Crystal B all Collaboration.We mainly calculate the total scattering cross section and differential scattering cross section,and give the image of the invariant mass distribution and angular distribution to compare with the experimental data.Our calculation results show Λ(1600)and Λ(1670)For the reaction process K-p→Λπ0π0 is needed,and after analyzing the low-end experimental data,we found that the contribution of new particles can be compared with the experimental data.It is expected that it may be the contribution of Λ(1520)at the low energy end of the experimental data or the contribution of the predicted particle∑*(1380).I hope there will be more experimental data for us to verify our conjecture in the future. |
