B0→ωη(′) and φη(′) decays in the perturbative QCD approach

We calculate the branching ratios and CP-violating asymmetries for B-0 ->omega eta,omega eta('),phi eta, and phi eta(') decays in the perturbative QCD (pQCD) factorization approach. The pQCD predictions for the CP-averaged branching ratios are Br(B-0 ->omega eta)=(2.7(-1.0)(+1.1))x10(-7), Br(B-0 ->omega eta('))=(0.75(-0.33)(+0.37))x10(-7), and Br(B-0 ->phi eta)=(6.3(-1.9)(+3.3))x10(-9), Br(B-0 ->phi eta('))=(7.3(-2.6)(+3.5))x10(-9) which are consistent with currently available experimental upper limits. The inclusion of the gluonic contribution can change the branching ratios of B ->omega(phi)eta(') decays by about 10%. The direct CP-violating asymmetries for B-0 ->omega eta and omega eta(') decays are generally large in size.