Measuring γ in B→Kππ decays

We reexamine the question of measuring the weak phase γ in B→Kππ decays. To this end, we express all B→Kππ amplitudes in terms of diagrams. We show that, as in B→Kπ, relations exist between certain tree and electroweak-penguin diagrams. The imposition of these relations allows the extraction of γ from measurements of the B→Kππ observables. We estimate the theoretical error in this method to be O(5%).