Decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>Mesons into Charged and Neutral Kaons

Abstract

Data on inclusive kaon production in ${e}^{+}{e}^{\ensuremath{-}}$ annihilations at energies in the vicinity of the $\ensuremath{\Upsilon}(4S)$ resonance are presented. A clear excess of kaons is observed on the $\ensuremath{\Upsilon}(4S)$ compared to the continuum. Under the assumption that the $\ensuremath{\Upsilon}(4S)$ decays into $B\overline{B}$, a total of 3.38\ifmmode\pm\else\textpm\fi{}0.34\ifmmode\pm\else\textpm\fi{}0.68 kaons per $\ensuremath{\Upsilon}(4S)$ decay is found. In the context of the standard $B$-decay model this leads to a value for $\frac{(b\ensuremath{\rightarrow}c)}{(b\ensuremath{\rightarrow}\mathrm{all})}$ of 1.09\ifmmode\pm\else\textpm\fi{}0.33\ifmmode\pm\else\textpm\fi{}0.13.