Search for B-+/-->[K--/+pi(+/-)](D)K-+/- and upper limit on the b -> u amplitude in B-+/--> DK +/-
- The decay of B± → [K∓π ±]DK ± is discussed. It is found that K∓π± pair originates from the decay of a D0 or D̄0. An upper limit is set on the ratio which is less than 0.026 (90% C.L.). This results in a small value of the amplitude ratio.
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