We analyze three different new physics scenarios for Δ F= 2 flavor-changing neutral currents
in the quark sector in the light of recent data on neutral-meson mixing. We parametrize …

We discuss a non-supersymmetric scenario which addresses the origin of the matter-parity
symmetry, PM=(− 1) 3 (B− L)+ 2 s, leading to a viable Dirac fermion dark matter candidate …

Meson and anti-meson mixing processes constitute an important source of constraints on
models that give tree level contributions to flavor violating neutral processes. In electroweak …

Flavor changing neutral current processes and family discrimination in 3-3-1 models -
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Extensions of the standard model with gauge symmetry SU (3) c⊗ SU (4) L⊗ U (1) X (3-4-1
extensions) where anomaly cancellation takes place between the fermion families (three …

We carry out a general analysis of tree-level flavor-changing neutral currents in the context
of 331 models, considering arbitrary quark and gauge boson mixing matrices. The results …

In the context of 331 models we analyze the phenomenology of exotic T quarks with electric
charge 2/3. We establish bounds for the corresponding masses and mixing angles and …

In the so-called 331-models the gauge anomalies cancel only if there are three generations
of fermions. This requires one of the quark generations to be in a different representation …

Flavor changing neutral processes (FCNP) arise as a natural outcome of the electroweak
SU (3) L× U (1) N models [1–4] because anomaly cancellations require at least that one …

A detailed study of the criteria for stability of the scalar potential and the proper electroweak
symmetry breaking pattern in the economical 3-3-1 model, is presented. For the analysis we …