We comment on the implications of the recently measured CP asymmetry in B → ΦKS decay. The data disfavor the Standard Model at 2.7 σ and -if the trend persists in the future with higher statistics require the existence of CP violation beyond that in the CKM matrix. In particular, the b → ss̄s decay amplitude would require new contributions of comparable size to the Standard Model ones with an or...

We study the effects of tree-level flavor changing neutral current and its present status with Cabibbo-Kobayashi-Maskawa matrix. Especially, we remark the effects of flavor changing neutral current on the unitary triangle of Cabibbo-Kobayashi-Maskawa matrix. In the case when the unitarity is nearly conserved, we find that the allowed FCNC in the db sector is zd db /V CKM td V CKM tb * ∼ O(10 −2...

A study of Rb and Rc is presented in the context of a Two Higgs Doublet Model (2HDM) with flavor changing scalar currents (FCSC). Implications of the model for the ρ-parameter and for b → sγ are also considered. The experimental data on Rb places stringent constraints on the model parameters. The configuration of the model needed to account for Rb is found to be irreconcilable with constraints ...

The observed pattern of neutrino mixing may be the result of a 2-3( μ−τ) symmetry in the leptonic sector. We consider a two higgs doublet model with a 2-3 symmetry in the down type quark and the charged lepton sector. The breaking of the 2-3 symmetry by the strange quark mass and the muon mass leads to FCNC in the quark sector and the charged lepton sector that are suppressed by ms mb and mμ mτ...