Constraints on economical 331 models from mixing ofK,Bd, andBsneutral mesons

Abstract

We analyze the effect of flavor changing neutral currents within 331 models. In particular, we concentrate in the so-called "economical" models, which have a minimal scalar sector. Taking into account the experimental measurements of observables related to neutral K and B meson mixing, we study the resulting bounds for angles and phases in the mixing matrix for the down quark sector, and the mass and mixing parameters related to the new Z ′ gauge boson.

Phenomenological aspects of the exotic T quark in 331 models

“…Indeed, as shown in Ref. [29], the latter lead to tree level FCNC mediated by the Z ′ gauge boson. In addition, in Eqs.…”

Flavor-changing neutral currents in 331 models

“…Within the economical 331 model, a general analysis of the constraints for masses and mixing angles from ∆F = 2 observables has been carried out in Ref. [12].…”

FCNC, CP violation and implications for some rare decays in an SU(4)_L X U(1)_X extension of the standard model

“…Flavor violating couplings of ordinary fermions to extra neutral gauge bosons and to new scalar fields arise in many extensions of the standard model (SM). Two simple and interesting examples are the 3-3-1 model in which the SM gauge symmetry is enlarged to SU (3) c ⊗ SU (3) L ⊗ U (1) X [1][2][3][4][5], and the 3-4-1 extension where the enlargement is done to the gauge group SU (3) c ⊗ SU (4) L ⊗ U (1) X [6][7][8][9][10]. These extensions share the important feature of addressing the problem of the number of fermion families in nature in the sense that anomaly cancellation among the families (three-family models) takes place only if we have an equal number of left-handed triplets and antitriplets (in the 3-3-1 model) or an equal number of 4-plets and 4 * -plets (in the 3-4-1 extension), taking into account the color degree of freedom.…”