B→K(∗)K̄

We present a new method for measuring the CP phase α. It requires the measurement of the pure penguin decays Bd0(t)→K(∗)K̄(∗) and Bs0→K(∗)K̄(∗). The method is quite clean: we estimate the theoretical uncertainty to be at most 5%. By applying the method to several K(∗)K̄(∗) 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.