ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2002, vol. 89, p. 231804/1-231804/6
Observation of Ds +K- and evidence for Ds + π- final states in neutral B decays
An overview is given on the first observation of a mode that is directly accessible through the spectator process. The mode ̄B0→Ds +K- may occur via W exchange or final rescattering, and predictions for its branching fraction vary over a wide range, 3X10-6-10-. The search for ̄B0→Ds +K- also encompasses B0→Ds +π-, a mode expected to be dominated by a (spectator) b→u transition.