Nonuniversal Z′′ couplings in B decays

We study the impacts of the nonuniversal Z(') model, providing flavor-changing neutral current at tree level, on the branching ratios (BRs), CP asymmetries (CPAs), and polarization fractions of B decays. We find that, for satisfying the current data, the new left- and right-handed couplings have to be included at the same time. The new introduced effective interactions not only could effectively explain the puzzle of small longitudinal polarization in B -> K-*phi decays, but also provide a solution to the small CPA of B-+/-->pi K-0(+/-). We also find that the favorable CPA of B-+/-->pi K-0(+/-) is opposite in sign to the standard model; meanwhile, the CPA of B-d ->pi K-0 has to be smaller than -10%. In addition, by using the values of parameters which are constrained by B ->pi K, we find that the favorable ranges of BRs, CPAs, longitudinal polarizations, and perpendicular transverse polarizations for (B-+/-->rho K-+/-(*),B-d ->rho K--/+(*+/-)) are (17.1 +/- 3.9,10.0 +/- 2.0)x10(-6), (3 +/- 5,21 +/- 7)%, (0.66 +/- 0.10,0.44 +/- 0.08), and (0.14 +/- 0.10,0.25 +/- 0.09), respectively.