Futher Study of CP Violation and Branching Ratios for B⁰→ J/ψKₛ and B⁰→ ϕKₛ in the Standard Model and Beyond

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In this work we study the CP violation for B⁰→ J/ψKₛ and B⁰→ ϕKₛ up to leading and next-to-leading order QCD corrections in the standard model, two-Higgs-doublet model and the minimal supersymmetric extension of the standard model. We also study the effect of new physics on the branching ratios of these two decay modes. We find that within the parameter space constrained by the observation of the decay b→ sγ, new physics does not affect the CP asymmetries greatly, and the prediction of new physics to the branching ratios of B⁰→ J/ψKₛ and B⁰→ ϕKₛ is the same as that of the standard model up to a minor discrepancy as far as the Yukama couplying constants are perturbative.