Novel sources of Flavor Changed Neutral Currents in the 331_RHN model

摘要

Sources of Flavor Changed Neutral Currents (FCNC) emerge naturally from a well motivated framework called 3-3-1 with right-handed neutrinos model, 331 _RHN for short, mediated by an extra neutral gauge boson Z′. Following previous work 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)]0bar{K}^{0}, D 0–[`(D)]0bar{D}^{0} and B 0–[`(B0)]bar{B^{0}} and show that, though one can discern that the Z′ contribution is the most relevant one for mesons oscillations purposes, scalar 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 B 0–[`(B0)]bar {B^{0}} system we set the bounds M _Z′≳4.2 TeV and M_S2,M_I3 >~7.5 TeVM_{S_{2}},M_{I_{3}} gtrsim7.5~mbox{TeV} in order to be consistent with the current measurements.