We study in detail models with vectorlike quarks, special emphasis on their implications for $\mathrm{CP}$ asymmetries ${B}^{0}$ decays. In this class of there are deviations from unitarity the Cabibbo-Kobayashi-Maskawa matrix and flavor-changing neutral currents which, although naturally suppressed, may have important consequences. show that even a relatively small contribution $Z$-mediated to ${B}^{0}\ensuremath{-}{\overline{B}}^{0}$ mixing can lead significant departures predictions standard model

We analyze \ensuremath{\Delta}C=2 transitions in the framework of a minimal extension standard model where either Q=2/3 or Q=-1/3 isosinglet quark is added to spectrum. In case quark, it shown that there significant region parameter space ${\mathit{D}}^{0}$-D${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}^{0}$ mixing sufficiently enhanced be observed at next round experiments. On contrary, pointed out obtaining substantial enhancement mixing, while complying with experimental constraints...

We examine some of the consequences having a Cabibbo-Kobayashi-Maskawa (CKM) matrix V with symmetric moduli. define an asymmetry parameter for three-generation CKM which can be simply expressed in terms eigenstates and eigenvalues V. The fact that experimentally is small implies two are almost degenerate and/or close to being real. point out it special feature three generations \ensuremath{\Vert}V\ensuremath{\Vert} made by appropriate choice quark field phases. analyze recent ansatz...

We propose a phenomenological model of two-zeros Majorana neutrino mass matrix based on the A4 symmetry, where structure mixing is unimodular second scheme trimaximal TM2, and charged lepton diagonal. show that, among seven possible two-zero textures with only two textures, namely texture Mee=0 Meμ=0 its permutation, are acceptable in non-perturbation method, since results associated these consistent experimental data. obtain unique relation between our phases, ρ+σ=ϕ±π, an effective equation...

The seesaw model of quark masses is studied systematically, focusing on its developments. A framework allowing the top mass to be order electroweak symmetry breaking scale, while remaining light quarks have much smaller masses, due mechanism, presented. violation GIM mechanism shown small and tree level FCNC are suppressed naturally. In this model, there many particles which could contribute in one-loop level. Parameters constrained by using experimental data K^0-\bar{K}^0 mixing \epsilon_K....

The overall characteristics of the solar and atmospheric neutrino oscillations are approximately consistent with a tribimaximal form mixing matrix $U$ lepton sector. Exact leads to $\theta_{13}=0$. However, results from Daya Bay RENO experiments have established, such that in comparison other angles, $\theta_{13}$ is small. Moreover, mass splitting differ by two orders magnitude. These significant differences constitutes great enthusiasm main motivation for our research herein reported....

Applying the $A_4$ symmetry in scenario of unimodular second scheme trimaximal $TM_2$ mixing matrix, where charged lepton mass matrix is diagonal and nature neutrinos are Majorana, we investigate analyze feasible two zeros neutrino matrices. Among seven possible two-zero textures with symmetry, have found that only textures, namely texture $(e, e)$ $(e,μ)$ vanishing element its permutation, consistent experimental data non-perturbation method. We also obtain new significant relations between...