Observation of B0→ωK0, B+→ηπ+, and B+→ηK+ and study of related decays

We present measurements of branching fractions and charge asymmetries for seven B-meson decays with an η, η', or ω meson in the final state. The data sample corresponds to 89x106 BB-bar pairs produced from e+e- annihilation at the Υ(4S) resonance. We measure the following branching fractions in units of 10-6: B(B+→ηπ+)=5.3±1.0±0.3, B(B+→ηK+)=3.4±0.8±0.2, B(B0→ηK0)=2.9±1.0±0.2 (<5.2, 90% C.L.), B(B+→η'π+)=2.7±1.2±0.3 (<4.5, 90% C.L.), B(B+→ωπ+)=5.5±0.9±0.5, B(B+→ωK+)=4.8±0.8±0.4, and B(B0→ωK0)=5.9-1.3+1.6±0.5. The charge asymmetries are Ach(B+→ηπ+)=-0.44±0.18±0.01, Ach(B+→ηK+)=-0.52±0.24±0.01, Ach(B+→ωπ+)=0.03±0.16±0.01, and Ach(B+→ωK+)=-0.09±0.17±0.01