The BLMSSM is an extension of the minimal supersymmetric standard model(MSSM).Its local gauge group is SU(3)C×SU(2)L×U(1)Y×U(1)B×U(1)L.Supposing the lightest scalar neutrino is a dark matter candid...The BLMSSM is an extension of the minimal supersymmetric standard model(MSSM).Its local gauge group is SU(3)C×SU(2)L×U(1)Y×U(1)B×U(1)L.Supposing the lightest scalar neutrino is a dark matter candidate,we study the relic density and the spin independent cross section of sneutrino scattering off a nucleon.We calculate the numerical results in detail and find a suitable parameter space.The numerical discussion can confine the parameter space and provide a reference for dark matter research.展开更多
Applying the effective Lagrangian method,we study the flavor changing neutral current process b→sγwithin the minimal supersymmetric extension of the Standard Model,where baryon and lepton numbers are local gauge sym...Applying the effective Lagrangian method,we study the flavor changing neutral current process b→sγwithin the minimal supersymmetric extension of the Standard Model,where baryon and lepton numbers are local gauge symmetries.Constraints on the parameters are investigated numerically with the experimental data for the branching ratioof B→X_(s)γAdditionally,we present the corrections to direct CP-violation in B→X_(s)γand time-de-pendent CP-asymmetry in B→K*γ.With appropriate assumptions on the parameters,we find the direct CP-viola-tion Acp is very small,while one-loop contributions to S K*γcan be significant.展开更多
The deviation of the measurement of RD （RD＊） from the Standard Model （SM） expectation is 2.3σ （3.1σ）. RD （RD＊） is the ratio of the branching fraction of ^-B→Dτ^-υτ （^-B→D^＊τ^-υτ ） to that of ^-B...The deviation of the measurement of RD （RD＊） from the Standard Model （SM） expectation is 2.3σ （3.1σ）. RD （RD＊） is the ratio of the branching fraction of ^-B→Dτ^-υτ （^-B→D^＊τ^-υτ ） to that of ^-B→Dl^-υι （^-B→Dl^-υι）, where l=e or μ. This anomaly may imply the existence of new physics （NP）. In this paper, we restudy this problem in the supersymmetric extension of the Standard Model with local gauged baryon and lepton numbers （BLMSSM）, and give one-loop corrections to RD （RD^＊）.展开更多
The minimal supersymmetric extension of the standard model(MSSM)is extended to the U(1)XSSM,whose local gauge group is SU(3)C×SU(2)L×U(1)Y×U(1)X.To obtain the U(1)XSSM,we add new superfields to the MSSM...The minimal supersymmetric extension of the standard model(MSSM)is extended to the U(1)XSSM,whose local gauge group is SU(3)C×SU(2)L×U(1)Y×U(1)X.To obtain the U(1)XSSM,we add new superfields to the MSSM,namely,three Higgs singletsηη,S and right-handed neutrinosνi.The charge conjugate and parity(CP)violating effects are considered to study the lepton electric dipole moment(EDM)in the U(1)XSSM.There are more CP violating phases in the U(1)XSSM than in the standard model(SM).In this model,several new parameters(θS,θBB′,θBL)are considered as CP violating phases;hence,there are new contributions to lepton EDMs.This is conducive to exploring the source of CP violation and probing new physics beyond the SM.展开更多
In response to the present status that searching for SUSY particles has been unsuccessful, we propose a bold scenario that SUSY particles are confined inside hadrons with a required condition of PR = 1 in analog to th...In response to the present status that searching for SUSY particles has been unsuccessful, we propose a bold scenario that SUSY particles are confined inside hadrons with a required condition of PR = 1 in analog to the color confinement for quarks. The scenario seems to be able to reconcile the beautiful SUSY theory and non-observation at present experiments. On other aspects, some loopholes in the proposal emerge and require to be answered in the future research.展开更多
In the present study,we investigated the decays of the top quark:t→cy,t→cg,t→cZ,and t→ch.They are extremely rare processes in the standard model(SM).As the U(1)extension of the minimal supersymmetric standard mode...In the present study,we investigated the decays of the top quark:t→cy,t→cg,t→cZ,and t→ch.They are extremely rare processes in the standard model(SM).As the U(1)extension of the minimal supersymmetric standard model(MSSM),the U(1)_X SSM features new superfields such as the right-handed neutrinos and three Higgs singlets.We analyzed the effects of different sensitive parameters on the results and made reasonable theoretical predictions,thereby providing a useful reference for future experimental development.Considering the constraint set by the updated experimental data,the numerical results show that the branching ratios of the four proccsscs,i.e.,t→cγ,cg,cZ,ch,can reach the same order of magnitude as their experimental upper limits.Among them,tanβhas the most evident effect on these processes and is the main parameter;g_(X),g_(YX),μ,M_(2),λ_(H),M_(U23)^(2),and M_(Q23)^(2) are also important parameters for the processes,and have effects on the numerical results.展开更多
基金Project supported by the National Natural Science Foundation of China(No.11202183)the National High-Tech R&D Program(863 Program)of China(No.2011AA11A101)+1 种基金the Public Projects of Zhejiang Province(No.2012C31023)the Zhejiang Provincial Natural Science Foundation of China(No.LQ12B01001)
基金Supported by National Natural Science Foundation of China(NNSFC)(11535002,11605037,11705045)Natural Science Foundation of Hebei Province(A2020201002)the youth top-notch talent support program of the Hebei Province。
文摘The BLMSSM is an extension of the minimal supersymmetric standard model(MSSM).Its local gauge group is SU(3)C×SU(2)L×U(1)Y×U(1)B×U(1)L.Supposing the lightest scalar neutrino is a dark matter candidate,we study the relic density and the spin independent cross section of sneutrino scattering off a nucleon.We calculate the numerical results in detail and find a suitable parameter space.The numerical discussion can confine the parameter space and provide a reference for dark matter research.
基金National Natural Science Foundation of China(11805140,11347185,11905002)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2017113)+2 种基金Natural Science Foundation of Shanxi Province(201801D221021,201801D221031)Natural Science Foundation of Hebei Province(A2020201002)the China Scholarship Council(201906935031)。
文摘Applying the effective Lagrangian method,we study the flavor changing neutral current process b→sγwithin the minimal supersymmetric extension of the Standard Model,where baryon and lepton numbers are local gauge symmetries.Constraints on the parameters are investigated numerically with the experimental data for the branching ratioof B→X_(s)γAdditionally,we present the corrections to direct CP-violation in B→X_(s)γand time-de-pendent CP-asymmetry in B→K*γ.With appropriate assumptions on the parameters,we find the direct CP-viola-tion Acp is very small,while one-loop contributions to S K*γcan be significant.
基金Supported by the NNSFC(11535002,11605037,11705045)the Natural Science Foundation of Hebei Province(A2016201010,A2016201069)+1 种基金the Natural Science Fund of Hebei University(2011JQ05,2012-242)and Hebei Key Lab of Opto-Electronic Information and Materials,the Midwest Universities Comprehensive Strength Promotion Project
文摘The deviation of the measurement of RD （RD＊） from the Standard Model （SM） expectation is 2.3σ （3.1σ）. RD （RD＊） is the ratio of the branching fraction of ^-B→Dτ^-υτ （^-B→D^＊τ^-υτ ） to that of ^-B→Dl^-υι （^-B→Dl^-υι）, where l=e or μ. This anomaly may imply the existence of new physics （NP）. In this paper, we restudy this problem in the supersymmetric extension of the Standard Model with local gauged baryon and lepton numbers （BLMSSM）, and give one-loop corrections to RD （RD^＊）.
基金National Natural Science Foundation of China(NNSFC)(11535002,11705045)Natural Science Foundation of Hebei Province(A2020201002)the youth top-notch talent support program of the Hebei Province。
文摘The minimal supersymmetric extension of the standard model(MSSM)is extended to the U(1)XSSM,whose local gauge group is SU(3)C×SU(2)L×U(1)Y×U(1)X.To obtain the U(1)XSSM,we add new superfields to the MSSM,namely,three Higgs singletsηη,S and right-handed neutrinosνi.The charge conjugate and parity(CP)violating effects are considered to study the lepton electric dipole moment(EDM)in the U(1)XSSM.There are more CP violating phases in the U(1)XSSM than in the standard model(SM).In this model,several new parameters(θS,θBB′,θBL)are considered as CP violating phases;hence,there are new contributions to lepton EDMs.This is conducive to exploring the source of CP violation and probing new physics beyond the SM.
基金Supported by the National Natural Science Foundation of China(NNSFC)under Grant Nos.11375128,11675082,11735010,and11535002
文摘In response to the present status that searching for SUSY particles has been unsuccessful, we propose a bold scenario that SUSY particles are confined inside hadrons with a required condition of PR = 1 in analog to the color confinement for quarks. The scenario seems to be able to reconcile the beautiful SUSY theory and non-observation at present experiments. On other aspects, some loopholes in the proposal emerge and require to be answered in the future research.
基金supported by the National Natural Science Foundation of China(12075074)the Natural Science Foundation of Hebei Province,China(A2020201002,A2022201022,A2022201017,A2023201040)+2 种基金the Natural Science Foundation of Hebei Education Department,China(QN2022173)the Postgraduate's Innovation Fund Project of Hebei University(HBU2024SS042)the Youth Top-notch Talent Support Program of the Hebei Province,China。
文摘In the present study,we investigated the decays of the top quark:t→cy,t→cg,t→cZ,and t→ch.They are extremely rare processes in the standard model(SM).As the U(1)extension of the minimal supersymmetric standard model(MSSM),the U(1)_X SSM features new superfields such as the right-handed neutrinos and three Higgs singlets.We analyzed the effects of different sensitive parameters on the results and made reasonable theoretical predictions,thereby providing a useful reference for future experimental development.Considering the constraint set by the updated experimental data,the numerical results show that the branching ratios of the four proccsscs,i.e.,t→cγ,cg,cZ,ch,can reach the same order of magnitude as their experimental upper limits.Among them,tanβhas the most evident effect on these processes and is the main parameter;g_(X),g_(YX),μ,M_(2),λ_(H),M_(U23)^(2),and M_(Q23)^(2) are also important parameters for the processes,and have effects on the numerical results.
