Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-06-11
Physics
High Energy Physics
High Energy Physics - Phenomenology
some figures being reduced, accepted by J. Physics G
Scientific paper
10.1088/0954-3899/24/11/003
In this work we study the CP violation for $\bar{B^0}\to J/\psi K_s$ and $\bar{B^0}\to \phi K_s$ 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 $b\to s\gamma$, new physics does not affect the CP asymmetries greatly, and the prediction of new physics to the branching ratios of $\bar{B^0}\to J/\psi K_s$ and $\bar{B^0}\to \phi K_s$ is the same as that of the standard model up to a minor discrepancy as far as the Yukama couplying constants are perturbative.
Du Dong-Sheng
Yang Mao-Zhi
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