First Observation of the Cabibbo Suppressed Decay $B^{+}\to {\bar{D}}^0{K}^{+}$

Abstract

We have observed the decay of the $B^{-}$ meson into $D^0{K}^{-}$, using 3.3 million $B\bar{B}$ pairs collected with the CLEO II detector at the Cornell Electron Storage Ring. We find the branching fractions of this decay to be suppressed relative to the decay into $D^0{\pi }^{-}$ by $0.055\pm 0.014\pm 0.005$.

12 page postscript file, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

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