We search for B+/--->[K(-/+)pi(+/-)](D)K+/- decays, where [K(-/+)pi(+/-)](D) indicates that the K(-/+)pi(+/-) pair originates from the decay of a D-0 or (D) over bar (0). Results are based on 120x10(6) Y(4S)-->BB<top></top> decays collected with the BABAR detector at SLAC. We set an upper limit on the ratio R-Kpi=[Gamma(B+-->[K(-)pi(+)](D)K+)+Gamma(B--->[K(+)pi(-)](D)K-)][Gamma(B+-->[K(+)pi(-)](D)K+)+Gamma(B--->[K(-)pi(+)](D)K-)]</den></fraction><0.026 (90% C.L.). This constrains the amplitude ratio r(B)equivalent toparallel toA(B--->(DK-)-K-0)/A(B--->(DK-)-K-0)parallel to<0.22 (90% C.L.), consistent with expectations. The small value of r(B) favored by our analysis suggests that the determination of the Cabibbo-Kobayashi-Maskawa phase gamma from B-->DK will be difficult.

Search for B-+/-->[K--/+pi(+/-)](D)K-+/- and upper limit on the b -> u amplitude in B-+/--> DK +/-

FERRONI, Fernando
2004

Abstract

We search for B+/--->[K(-/+)pi(+/-)](D)K+/- decays, where [K(-/+)pi(+/-)](D) indicates that the K(-/+)pi(+/-) pair originates from the decay of a D-0 or (D) over bar (0). Results are based on 120x10(6) Y(4S)-->BB decays collected with the BABAR detector at SLAC. We set an upper limit on the ratio R-Kpi=[Gamma(B+-->[K(-)pi(+)](D)K+)+Gamma(B--->[K(+)pi(-)](D)K-)][Gamma(B+-->[K(+)pi(-)](D)K+)+Gamma(B--->[K(-)pi(+)](D)K-)]<0.026 (90% C.L.). This constrains the amplitude ratio r(B)equivalent toparallel toA(B--->(DK-)-K-0)/A(B--->(DK-)-K-0)parallel to<0.22 (90% C.L.), consistent with expectations. The small value of r(B) favored by our analysis suggests that the determination of the Cabibbo-Kobayashi-Maskawa phase gamma from B-->DK will be difficult.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12571/3020
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