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Science China(Physics,Mechanics & Astronomy) 2020年第8期63卷 61-70页

作者： Xu-Chang Zheng Chao-Hsi Chang tai-fu feng Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics Chongqing UniversityChongqing 401331China China Center of Advanced Science and Technology(CCAST)(World Laboratory) Beijing 100190China Department of Physics Hebei UniversityBaoding 071002China

To test the standard model(SM)precisely and to look for the clues deviating from SM,a proposal for determining the effective electro-weak mixing angles sin2θefff(particularly f=lept,c,b)is *** is via observing the asymmetries(the forward-backward one AFB,the left-right one ALR and the combined left-right forward-backward one ALRFB)of the doubly heavy-flavored hadrons in the production at a super Z-factory(an e+e-collider designed with a luminosity as high as possible for modernday techniques runs around the center-of-mass energy s1/2=mZ).To see the sensitivity,uncertainties as well as the event accumulation precisely,the observables for describing the asymmetries of the produced hadrons are computed numerically with varying effective mixing angles,and based on the result analyses,it is concluded that the proposal may offer an independent complement determination of the effective mixing angles.

关键词： electro-weak mixing angle production of doubly heavy-flavored hadron asymmetries super Z-factory

Nuclear 0ν2βdecays in B-L symmetric SUSY model and in TeV scale left–right symmetric model

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Communications in Theoretical Physics 2022年第8期74卷 76-92页

作者： Jin-Lei Yang Chao-Hsi Chang tai-fu feng CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Physics Hebei UniversityKey Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei ProvinceBaoding071002China

In this paper,we take the B-L supersymmetric standard model(B-LSSM)and TeV scale left–right symmetric model(LRSM)as two representations of the two kinds of new physics models to study the nuclear neutrinoless double beta decays(0ν2β)so as to see the senses onto these two kinds of models when the decays are taken into account *** the parameter spaces allowed by all the existing experimental data,the decay half-life of the nucleus^(76)Ge and^(136)Xe,T_(12)^(0ν)(^(76)Ge,^(136)Xe),is precisely calculated and the results are presented *** on the numerical results,we conclude that there is greater room for LRSM type models than for B-LSSM type models in foreseeable future experimental observations on the decays.

关键词： B-LSSM QCD correction neutrinoless double beta decay LRSM

Muon anomalous Muon anomalous Muon anomalous magnetic dipole moment in theμνSSM

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Chinese Physics C 2022年第9期46卷 103-114页

作者： Hai-Bin Zhang Chang-Xin Liu Jin-Lei Yang tai-fu feng Department of Physics Hebei UniversityBaoding 071002China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding 071002China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China College of Physics Chongqing UniversityChongqing 400044China Department of Physics Guangxi UniversityNanning530004China

Recently,the Muon g-2 experiment at Fermilab measured the muon anomalous magnetic dipole moment(MDM),aμ=(gμ-2)/2,and reported that the new experimental average increases the difference between the experiment and the standard model(SM)prediction to 4.2σ.In this work,we reanalyze the muon anomalous MDM at the two-loop level in theμfrom theνSupersymmetric Standard Model(μνSSM)combined with the updated experimental ***μνSSM can explain the current difference between the experimental measurement and the SM theoretical prediction for the muon anomalous MDM,constrained by the 125 GeV Higgs boson mass and decays,the rare decayˉB→Xsγ,and so *** also investigate the anomalous MDM of the electron and tau lepton,ae=(ge-2)/2 and aτ=(gτ-2)/2,at the two-loop level in theμν*** addition,the decaying of the 125 GeV Higgs boson into a pair of charged leptons in theμνSSM is analyzed.

关键词： supersymmetry magnetic dipole moment Higgs boson decays

W boson mass in NP models with an extra U(1)gauge group

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Chinese Physics C 2024年第11期48卷 15-21页

作者： Jin-Lei Yang Zhao-feng Ge Xiu-Yi Yang Sheng-Kai Cui tai-fu feng Department of Physics Hebei UniversityBaoding 071002China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding 071002China CAS Key Laboratory of Theoretical Physics School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China School of Science University of Science and Technology LiaoningAnshan 114051China

The precise measurement of the W boson mass is closely related to the contributions of new physics(NP),which can significantly constrain the parameter space of NP models,particularly those with an additional U(1)local gauge *** inclusion of a new Z'gauge boson and gauge couplings in these models can contribute to the oblique parameters S,T,and U and the W boson mass at tree *** the effects of kinetic mixing,in this study,we calculate and analyze the oblique parameters S,T,and U and the W boson mass in such NP *** find that the kinetic mixing effects can make significant contributions to the W boson mass,and these contributions can be eliminated by redefining the gauge boson fields by removing neutral currents with charged leptons if the leptonic Yukawa couplings are invariant under the extra U(1)local gauge group,even with nonzero kinetic mixing effects.

关键词： extra U(1) oblique parameters kinetic mixing

Study of lepton EDMs in the U(1)X SSM

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Chinese Physics C 2022年第9期46卷 36-47页

作者： Lu-Hao Su Dan He Xing-Xing Dong tai-fu feng Shu-Min Zhao Department of Physics Hebei UniversityBaoding 071002China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding 071002China Department of Physics Chongqing UniversityChongqing 401331China

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)*** obtain the U(1)XSSM,we add new superfields to the MSSM,namely,three Higgs singletsηη,S and right-handed neutrinosν*** charge conjugate and parity(CP)violating effects are considered to study the lepton electric dipole moment(EDM)in the U(1)*** 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 *** is conducive to exploring the source of CP violation and probing new physics beyond the SM.

关键词： lepton electric dipole moment

Top-quark rare decays with flavor violation

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Chinese Physics C 2024年第9期48卷 68-81页

作者： Ming-Yue Liu Shu-Min Zhao Song Gao Xing-Yu Han tai-fu feng Department of Physics Hebei UniversityBaoding 071002China Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory Baoding 071002China Hebei Research Center of the Basic Discipline for Computational Physics Baoding 071002China Department of Physics Chongqing UniversityChongqing 401331China

In the present study,we investigated the decays of the top quark:t→cy,t→cg,t→cZ,and t→*** 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 *** analyzed the effects of different sensitive parameters on the results and made reasonable theoretical predictions,thereby providing a useful reference for future experimental *** 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 *** 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.

关键词： Top quark flavor violation U(1)_(X)SSM new physics

Scalar neutrino dark matter in the BLMSSM

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Chinese Physics C 2021年第9期45卷 73-80页

作者： Ming-Jie Zhang Shu-Min Zhao Xing-Xing Dong Zhong-Jun Yang tai-fu feng Department of Physics Hebei UniversityBaoding 071002China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding 071002China Department of Physics Chongqing UniversityChongqing 401331China

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)*** 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 *** calculate the numerical results in detail and find a suitable parameter *** numerical discussion can confine the parameter space and provide a reference for dark matter research.

关键词： dark matter sneutrino supersymmetry

Leptonic di-flavor and di-number violation processes at high energyμ^(±)μ^(±)colliders

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Chinese Physics C 2024年第4期48卷 34-50页

作者：杨金磊张肇西冯太傅 CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Department of Physics Hebei UniversityKey Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei ProvinceBaoding 071002China

The leptonic di-flavor violation (LFV) processes μ^(±)μ^(±)→e^(±)e^(±) and μ^(±)μ^(±)→τ^(±)τ^(±) and leptonic di-number violation (LNV) processes μ^(±)μ^(±)→W_(i)^(±)W_(j)^(±) (i,j=1,2) at same-sign high energy μ^(±)μ^(±) colliders are studied. The new physics (NP) factors that may play roles in these processes are highlighted by cataloging them into three types. Taking into account the experimental constraints, the processes at μ^(±)μ^(±) colliders are computed, and the results are presented properly. The results lead to the conclusion that observing the NP factors through the LFV and LNV processes at TeV-energy μ^(±)μ^(±) colliders has significant advantages that cannot be achieved elsewhere. Therefore, once the techniques for muon acceleration and collision are developed successfully, the option of building same-sign high energy muon colliders should be seriously considered.

关键词： μ^(±)μ^(±)collider neutral lepton Majorana components

Corrections to R_D and R_(D~*) in the BLMSSM

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Chinese Physics C 2018年第11期42卷 33-44页

作者： Zhong-Jun Yang Shu-Min Zhao Xing-Xing Dong Xi-Jie Zhan Hai-Bin Zhang tai-fu feng National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices Department of PhysicsHebei UniversityBaoding 071002China

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^＊）.

关键词： supersymmetry BLMSSM semileptonic decay

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B→X_(s)γin BLMSSM

Chinese Physics C 2021年第5期45卷 39-48页

作者： Jian-Bin Chen Meng Zhang Li-Li Xing tai-fu feng Shu-Min Zhao Ke-Sheng Sun College of Physics and Optoelectronic Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Physics Hebei UniversityBaoding 071002China Department of Physics Baoding UniversityBaoding 071000.China

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 *** 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.

关键词： BLMSSM electroweak radiative corrections B decay