Nonspectator contribution: A mechanism for inclusive $\overrightarrow{B}{X}_s{\eta }^{\prime }$ and exclusive $\overrightarrow{B}{K}^{\left(*\right)}{\eta }^{\prime }$ decays

We propose a mechanism that can explain the large $B\left(\overrightarrow{B}{X}_s{\eta }^{\prime }\right)\approx {10}^{-3}$ observed by CLEO. In this mechanism, ${\eta }^{\prime }$ is produced by the fusion of two gluons: one from the QCD penguin diagram $\overrightarrow{b}\mathrm{sg}$ and the other one emitted by the light quark inside the $B$ meson. The inclusive decay rate which is calculated via the factorization assumption can easily account for the observed branching ratio. We also estimate the exclusive branching ratio $B\left(\overrightarrow{B}K{\eta }^{\prime }\right)=7.0\mathrm{}\times {10}^{-5}$ which is in good agreement with the experimental data and present our prediction for the $K^{*}$ mode $B\left(\overrightarrow{B}{K}^{*}{\eta }^{\prime }\right)=3.4\mathrm{}\times {10}^{-5}$.