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Phys. Rev. Lett. 93, 131804 (2004) [7 pages]

Search for B±→[Kπ±]DK± and Upper Limit on the bu Amplitude in B±DK±

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B. Aubert et al. BABAR Collaboration
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Received 12 February 2004; published 23 September 2004

We search for B±→[Kπ±]DK± decays, where [Kπ±]D indicates that the Kπ± pair originates from the decay of a D0 or D̅ 0. Results are based on 120×106 Υ(4S)→BB̅ decays collected with the BABAR detector at SLAC. We set an upper limit on the ratio RKπ≡ [Γ(B+→[K-π+]DK+)+Γ(B-→[K+π-]DK-)]/[Γ(B+→[K+π-]DK+)+Γ(B-→[K-π+]DK-)]<0.026 (90%   C.L.). This constrains the amplitude ratio rB≡ |A(B-D̅ 0K-)/A(B-D0K-)|<0.22 (90% C.L.), consistent with expectations. The small value of rB favored by our analysis suggests that the determination of the Cabibbo-Kobayashi-Maskawa phase γ from BDK will be difficult.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.131804
DOI:
10.1103/PhysRevLett.93.131804
PACS:
13.25.Hw, 12.15.Hh