A phase ΞΞ¦ between amplitudes for B0βKβ0Ο0 and B0βKβ+Οβ plays a crucial role in a method for constraining
Cabibbo-Kobayashi-Maskawa (CKM) parameters. We present a general argument for
destructive interference between amplitudes for B0βKβ+Οβ and B0βKβ0Ο0 forming together a smaller I(KβΟ)=3/2 amplitude.
Applying flavor SU(3) and allowing for conservative theoretical uncertainties,
we obtain lower limits on β£ΞΞ¦β£ and its charge-conjugate. Values of
these two phases favored by the BaBar Collaboration are in good agreement with
our bounds.Comment: 12 pages, 6 figures; slight revisions and clarification