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Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>ω</mml:mi><mml:msup><mml:mi>K</mml:mi><mml:mo>±</mml:mo></mml:msup></mml:math>Decay
We report the first observation of the charmless two-body mode B±→ωK± decay, and a new measurement of the branching fraction for the B±→ωπ± decay. The measured branching fractions are B(B±→ωK±)=(9.2+2.6−2.3±1.0)×10−6 and B(B±→ωπ±)=(4.2+2.0−1.8±0.5)×10−6. We also measure the partial rate asymmetry of B±→ωK± decays and obtain ACP=−0.21±0.28±0.03. The results are based on …