Search

Using the effective Lagrangian approach, we develope the trilinear contributions originated in the dimension-six electroweak invariants ÕW = (1/3)εijkWiμvWjvλWkλμ and ÕWB = (1/2)BαβWcαβ[uppercase_phi_synonym]†τc[uppercase_phi_synonym], and then we insert the corresponding vertices in a one-loop ttV diagram, with V off-shell, generating the structure of the electric dipole moment. Using a nonlinear gauge, we prove that the results are gauge independent. Finally, we present the analytic expressions for the electric dipole form factors originated in each invariant introduced. [ABSTRACT FROM AUTHOR]

A study on the TESLA measurement expectations for Lepton Flavour Violation (LFV) leptonic Z → l[SUBi]l[SUBi] decays is presented. We have explored both the decoupling and non-decoupling scenarious in the Effective Lagrangian formalism as a way to include general beyond the Standard Model (SM) effects. As the effective lagrangian complies with the SM gauge symmetries by construction, we have relationships between photon and Z processes that are fully exploited. The consequence is that several restrictions can be put on the Z → μe decay whilst Z → τl could be still at reach of the Giga-Z mode in TESLA. [ABSTRACT FROM AUTHOR]

We list all possible operators up to dimension 8 which induce the triple neutral gauge boson couplings ZZγ, Zγγ, and ZZZ within the decoupling effective Lagrangian approach. [ABSTRACT FROM AUTHOR]

A complete calculation at one-loop level for the gggV, ggγV (V = Z,Z') couplings is presented in the context of the minimal 3-3-1 model, wich predicts the existence of a new Z' gauge boson and new exotic quarks. Bose symmetry is exploited to write a compact and manifest SUC(3)-invariant vertex function for the gggV coupling. Previous results on the Z → ggg,ggγ are reproduced. It is found that these decays are insensitive to the effects of new exotic quarks. This in contrast with the Z' →ggg,ggγ decays, specially the last case where the exotic quarks contribution dominates. [ABSTRACT FROM AUTHOR]

The highlights of an effective Lagrangian analysis of the lepton-flavor violating reaction μ[SUP-]μ[SUP+] →μ[SUP±τ[SUP∓ are presented. We consider the scenario in which the lepton flavor violation is induced by the Higgs scalar boson. Further results will be presented elsewhere. [ABSTRACT FROM AUTHOR]