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B -> K(*) Kbar(*) Decays: A New Method for Measuring the CP Phase α

Alakabha Datta·David London
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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 B_s -> 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, αcan be extracted with a fourfold ambiguity. An additional assumption reduces this ambiguity to twofold: {α, α+ π}. Since no \pi0 detection is needed, this method can be used at hadron colliders.

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Alakabha Datta, David London. 2002-02-18. B -> K(*) Kbar(*) Decays: A New Method for Measuring the CP Phase α. https://doi.org/10.1016/s0370-2693(02)01598-8

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