Momentum Spectrum of ${\eta }^{\mathrm{\prime }}$ Meson in the Inclusive Decay $B\to {\eta }^{\mathrm{\prime }}{X}_s$

The momentum distribution for the ${\eta }^{\mathrm{\prime }}$ meson produced through the inclusive decay $B\to {\eta }^{\mathrm{\prime }}X$ is investigated under two decay mechanisms, $b\to {\eta }^{\mathrm{\prime }}s$ and $b\to {\eta }^{\mathrm{\prime }}sg$. Although all these two mechanisms can explain the recently observed decay rate of $B\to {\eta }^{\mathrm{\prime }}X$, the momentum spectrums for ${\eta }^{\mathrm{\prime }}$ meson predicted by them are strongly different. Thus detailed experiment is proposed to distinguish the two cases.