B -> K(*) Kbar(*) Decays: A New Method for Measuring the CP Phase α
Abstract
We present a new method for measuring the CP phase α. It requires the measurement of the pure penguin decays Bd(t) -> K(*) Kbar(*) and Bs -> K(*) Kbar(*). The method is quite clean: we estimate the theoretical uncertainty to be at most 5%. By applying the method to several K(*) Kbar(*) final states, α can be extracted with a fourfold ambiguity. An additional assumption reduces this ambiguity to twofold: α, α + π. Since no π0 detection is needed, this method can be used at hadron colliders.
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