0000000000861569

AUTHOR

Tai-fu Feng

showing 5 related works from this author

Anomalous Higgs–top-quark couplings in the MSSM

2004

The anomalous couplings of the top quark and the Higgs boson have been studied in an effective theory deduced from the minimal supersymmetric extension of the standard model as the heavy fields are integrated out. Constraints on the parameters of the model from the experimental data of ${R}_{b}=\ensuremath{\Gamma}(\stackrel{\ensuremath{\rightarrow}}{Z}b\overline{b})/\ensuremath{\Gamma}(\stackrel{\ensuremath{\rightarrow}}{Z}\mathrm{hadrons})$ are obtained.

PhysicsNuclear and High Energy PhysicsTop quarkParticle physicsHigh Energy Physics::PhenomenologyHadronEffective lagrangianEffective field theoryHiggs bosonFeynman graphSupersymmetryStandard ModelPhysical Review D
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Two-loop gluino contributions to the neutron electric dipole moment in theCP-violating minimal supersymmetric standard model

2005

We analyze two-loop gluino corrections to the neutron electric dipole moment (EDM) in the minimal supersymmetry extension of the standard model (MSSM). The dependence of two-loop corrections on the relevant CP violating phases differs from that of the one-loop contributions, and there is a region in the parameter space where the two-loop contributions are comparable with the one-loop contributions. Our numerical results show that the two-loop corrections can be as large as 30% of the one-loop results.

PhysicsNuclear and High Energy PhysicsParticle physicsGluinoNeutron electric dipole moment010308 nuclear & particles physicsHigh Energy Physics::PhenomenologySuperpartnerSupersymmetry01 natural sciencesStandard ModelQuantum electrodynamics0103 physical sciencesCP violationNeutron010306 general physicsMinimal Supersymmetric Standard ModelPhysical Review D
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The two-loop supersymmetric corrections to lepton anomalous magnetic and electric dipole moments

2006

Using the effective Lagrangian method, we analyze the electroweak corrections to the anomalous dipole moments of lepton from some special two-loop topological diagrams which are composed of neutralino (chargino) - slepton (sneutrino) in the minimal supersymmetric extension of the standard model (MSSM). Considering the translational invariance of the inner loop momenta and the electromagnetic gauge invariance, we get all dimension 6 operators and derive their coefficients. After applying equations of motion to the external leptons, the anomalous dipole moments of lepton are obtained. The numerical results imply that there is a parameter space where the two-loop supersymmetric corrections to …

PhysicsNuclear and High Energy PhysicsParticle physicsMuon010308 nuclear & particles physicsElectroweak interactionHigh Energy Physics::PhenomenologyFOS: Physical sciencesSupersymmetry01 natural sciences3. Good healthHigh Energy Physics - PhenomenologyStandard Model (mathematical formulation)DipoleHigh Energy Physics - Phenomenology (hep-ph)Quantum electrodynamics0103 physical sciencesCP violationHigh Energy Physics::ExperimentGauge theory010306 general physicsLepton
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Two-loop gluino corrections to the inclusive decayB→Xsγin theCPviolating MSSM with largetanβ

2004

We investigate two-loop gluino corrections to the effective Lagrangian for b{yields}s+{gamma}(g) in the minimal supersymmetric extension of the standard model (MSSM) at large tan{beta}, including the contributions in which quark flavor change is mediated by charginos. Using the translation invariance of loop momenta and the Ward-Takahashi identities that are required by the SU(3){sub c}xU(1){sub em} gauge invariance, we simplify our expressions to concise forms. As an example, we discuss two-loop gluino corrections to the CP asymmetry of inclusive B{yields}X{sub s}{gamma} decay in CP violating MSSM.

QuarkPhysicsNuclear and High Energy PhysicsGluinoParticle physics010308 nuclear & particles physicsHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologySuperpartnerSupersymmetry01 natural sciencesStandard Model (mathematical formulation)0103 physical sciencesCP violationHigh Energy Physics::ExperimentB mesonGauge theory010306 general physicsPhysical Review D
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The two-loop gluino's corrections on the inclusive b ---> x(s) gamma decay in the CP violation MSSM with large tan beta

2004

We investigate two-loop gluino corrections to the effective Lagrangian for b ! s g in the minimal supersymmetric extension of the standard model (MSSM) at large tan , including the contributions in which quark flavor change is mediated by charginos. Using the translation invariance of loop momenta and the Ward-Takahashi identities that are required by the SU3 c U1 em gauge invariance, we simplify our expressions to concise forms. As an example, we discuss two-loop gluino corrections to the CP asymmetry of inclusive B ! Xs decay in CP violating MSSM. peerReviewed

two-loop gluino correctionsHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyHigh Energy Physics::Experiment
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