Troca de sabor em extensões do modelo padrão.

Abstract

ivated framework called 3-3-1 with right-handed neutrinos model, 331RHN for short, mediated by an extra neutral gauge boson Z. Following previous works we calculate these sources and in addition we derive new ones coming from CP-even and -odd neutral scalars which appear due to their non-diagonal interactions with the physical standard quarks. Furthermore, by using 4 texture zeros for the quark mass matrices, we derive the mass difference terms for the neutral mesons systems K 0 − ¯ K 0 , D 0 − ¯ D 0 and B 0 − ¯ B 0 and show that, though one can discern that the Z ′contribution is the most relevant one for mesons oscillations purposes, scalars contributions play a role also in this processes and hence it is worthwhile to investigate them and derive new bounds on space of parameters. In particular, studying the B0−¯B0 system we set the bounds MZ ′ & 4.2 TeV and MS2 , MI3 & 7.5 TeV in order to be consistent with the current measurements.