The Study Of Partial Decoupling Effect In Extension Of The Minminal Supersymmetric Standard Model

The standard model of particle physics successfully unifies and describes electromagnetic interaction,weak interaction and strong interaction,and covers all known elementary particles.With the discovery of top quark,?neutrino and Higgs boson,the prediction of the standard model has been confirmed step by step,and its theoretical guiding position can not be shaken.Although the stan-dard model is self-consistent in theory and has achieved great success in providing experimental prediction,there are still some shortcomings,such as the problem of”specification level”.It also failed to provide candidates for dark matter and dark energy.This shows that we should expand on the basis of the standard model to find a new physics beyond the standard model.supersymmetry the-ory is an important direction of the extension of the standard model.In this paper,based on the minminal symmetric standard model(MSSM),the mass of Higgs particles and its related applications are discussed,and the MSSM and its extended model are systematically studied.On the basis of MSSM,we intro-duce vector particles,which are called the minminal symmetric standard model with vecton(MSSMV).With vector particles.MSSM solves the”specification level”problem of the standard model through the supersymmetry property,and predicts that the light neutral Higgs boson h~0mass can only be corrected by ra-diation to exceed the mass of Z boson.Now,some extended supersymmetry models have been developed with the main motivation of improving the quality of h~0.For example,some models of the fourth generation quark or lepton are studied,but in the framework of supersymmetry,in order to avoid the limitation of looking for supersymmetry particles in the experiment,the quark mass of the fourth generation will be too heavy to destroy the perturbation theory.And it will be excluded by the limitation of electric weak parameters,and the unity of supersymmetry gauge coupling coefficient can not be realized.These problems can be solved by introducing additional vector particles.If the scalar particles in the vector super-multiple state are heavier than the fermions,It has a positive correction for m_h0.Through the study,we find that:1.The correction of Higgs mass in MSSMV mainly depends on quarks,mass splits between standard quarks and mass splits between standard quarks,which leads to semi-decoupling effect,that is,when quarks and standard quarks are light and heavy,or when the mass split of the standard quark double state is very large,the heavy particles are decoupling,but the light particles also contribute greatly to the mass of Higgs.2.There is a parameter space in MSSMV,which makes the Higgs quality of the standard-like model reach the experimental result of LHC 125GeV,and the model realizes the main goal of improving the quality of Higgs.3.In the parameter space allowed by MSSMV,there are vector-like quarks with a mass of hundreds of GeV,which may be observed on LHC in the future.