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Recently the branching ratios for $B^+\to K^+\bar K^0$ and $B^0 \to K^0 \barK^0$ have been measured. Data indicate that the annihilation amplitudes inthese decays are not zero. A non-zero annihilation amplitude plays an importantrole in CP violation for $B^+\to \pi^+ K^0, K^+ \bar K^0$. Using the measuredbranching ratios for these decays, we show that there is an absolute bound of5% for the size of CP asymmetry in $B^+\to \pi^+ K^0$ from a relation betweenthe amplitudes of these decays. The size of CP asymmetry in $B^+ \to K^+\barK^0$ can, however, be as large as 90%. Future experimental data will test thesepredictions.Comment: 9 pages, 3 figures; version added a few references and corrected a  typo; the final version to appear at PR

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Annihilation contributions and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>asymmetries in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" …

Annihilation contributions andCPasymmetries inB+→π+K0,