Explaining B→Kπ anomaly with nonuniversal Z' boson

We study the effect of a nonuniversal Z(') boson in the decay modes B -> K pi. In the standard model these modes receive dominant contributions from b -> s QCD penguins. Therefore, in this limit one expects (S pi K0)-K-0 approximate to sin2 beta, A(pi)(0)K(0)approximate to 0, and A(pi)(0)K(-)approximate to A(pi)(+)K(-). The corrections due to the presence of small nonpenguin contributions is found to yield (S pi K0)-K-0 > sin2 beta and Delta A(CP)(K pi)similar or equal to 2.5%. However, the measured value of (S pi K0)-K-0 is less than sin2 beta and Delta A(CP)(K pi)similar or equal to 15%. We show the model with a nonuniversal Z(') boson can successfully explain these anomalies.