Study on Bd → ϕ KS Decay in EDQS Model

Abstract

We study Bd → ϕKS decay in extra down-type quarks (EDQS) model with a non-universal Z boson associated with flavor changing neutral currents (FCNCs) at the tree level. With the up-to-date experimental data of Br(Bd → ϕKS), SϕKS, and AϕKS, we derive the bounds on the Z-b-s coupling parameter |Ubs| and the new weak phase ϕ, using the constrained parameter spaces, we finally give predictions for Bs → ϕϕ decay, which could be tested at the Fermilab Tevatron and the LHC-b experiments.