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algebras such as , , and . These investigations,however, have been made for only a few cases ofquantum superalgebras, e. g., . In this report themethod is applied to the quantum superalgebra . First,representations in the CS basis of the superalgebra , asan intermediate step, and then, representations in theCS basis of its quantum deformation , are constructed.Our results lead to a boson-fermion realization moregeneral than those obtained earlier by other authors. Weexpect that the present results will be useful ininvestigations of current super-algebras, quantumsuper-algebras, and conformal field theories.Người trình bày: Nguyễn Công Kiên15. The Production And Decays Of Mirror ChargedLeptons And Electroweak-Scale Right-HandedNeutrinosPhạm Quang Hưng, Nguyễn Như LêThe model of electroweak-scale right-handed neutrinomass based on the assumption of the existence of mirrorfermions leads to the Majorana mass of the right-handedneutrino being of the order of the electroweak scale orsmaller. In the present paper, the total decay width ofright-handed neutrinos and mirror charged leptons hasbeen calculated. Analytical expressions for the totaldecay width of those particles are obtained. Thenumerical results show that when masses of leptonsvary, the order of maximum value of decay width isO(10 GeV), i.e, those leptons can be detected inThành phố Đồng Hới (03- 06/8/2009) Trang 29/ 102colliders. The main signatures would be like-signdileptons with displaced vertices plus one or two W’s.Người trình bày: Nguyễn Như Lê16. q- Deformed crystal lattice vibration of genericatomic stringNguyễn Thị Hà Loan, Đinh Xuân Cấp, Đinh Văn TìnhWe construct a q - deformed crystal lattice vibration forgeneric atomic string and consider an energy spectrumof this vibration.Người trình bày: Nguyễn Thị Hà Loan17. Symmetry Factor of Feynman DiagramsLê Thọ Huệ, Hà Thanh Hùng, Hoàng Ngọc Long,Nguyễn Huy Thảo, Đinh Phan KhôiThe symmetry factor of Feynman diagrams for real andcomplex scalar fields is presented. Being analysis ofWick expansion for Green functions, the mentionedfactor in general form is derived. The symmetry factorcan be separated into two ones corresponding to that ofconnected and vacuum diagrams. The determination ofsymmetry factors for the vacuum diagrams is necessaryas they play a role in the effective action and phasetransitions in cosmology.Người trình bày: Hoàng Ngọc Long18. Magneto- Gravitational Field in the VectorModel for Gravitational FieldVõ Văn ỚnThành phố Đồng Hới (03- 06/8/2009) Trang 30/ 102