E~+e~-?hhZ In The B-L Symmetric SSM

In 2012,physicists at European Organization for Nuclear Research(CERN)noticed that there was a new particle in the Large Hadron Collider(LHC)whose production and decay characteristics were very consistent with the Higgs boson in the Standard Model(SM).The news immediately caused a great sensation at the time.Physicists believe that this particle is likely to be an undiscovered Higgs particle in the SM.It was not until 2013 that CERN issued a press announcement again:After many experiments,and combined with the analysis of multiple sets of experimental data,all kinds of evidence showed that the newly discovered particles were Higgs bosons.All particles in the Standard Model were discoveredAmong the particles predicted by the SM,the Higgs boson was the last particle to be discovered.Its discovery proves that correctness of the particles mass produced by the spontaneous symmetry breaking.Nevertheless,some other questions also arise.For example,is the discovered particle really the Higgs boson predicted by the SM?Are there other neutral or charged scalar fields?Whether or not the couplings of Higgs with matter fields or gauge fields meets the theorectical predictions of the SM?In addition,the SM can not provide the candidates for dark matter,can not explain the asymmetry of matter and antimatter in the universe,etc.,so these require us to look for new physics beyond the SMWe choose to proceed our work under the theoretical framework of the minimal supersymmetric extension of the SM(MSSM)with U(1)B-L local gauge symmetry.The B-L Symmetric SM(B-LSSM)is one of the simple extension models of the MSSM,which is based on the gauge symmetry group SU(3)C(?)SU(2)L(?)U(1)Y(?)U(1)B-L.Where B stands for the baryon number and L stands for the lepton number,respectively.In this work,we analyze the cross section of e+e-?hhZ in the B-LSSM,here h denotes the lightest Higgs boson with 125 GeV.Considering the constraints from the updated prediction data,we find that the cross section of this process in the model depends on some parameters strongly,for example tan?',gYB,gB.We also considered the one-loop correction of the effective potential to the Higgs mass and the trilinear coupling vertex.Through our analysis,we found that these corrections have little effect on the results and can be safely ignored.