Decay ofBMesons into Charged and Neutral Kaons

Data on inclusive kaon production in e⁺e^- annihilations at energies in the vicinity of the Υ(4S) resonance are presented. A clear excess of kaons is observed on the Υ(4S) compared to the continuum. Under the assumption that the Υ(4S) decays into BB̄, a total of 3.38±{}0.34±{}0.68 kaons per Υ(4S) decay is found. In the context of the standard B-decay model this leads to a value for (b→c)(b→all) of 1.09±{}0.33±{}0.13.