Color-octet intrinsic charm inη′andB→η′Xdecays

The color-octet mechanism for the decay $B\to {\eta }^{\prime }X$ is proposed to explain the large branching ratio of $B(B\to {\eta }^{\prime }X)\sim 1\times {10}^{-3}$ recently announced by CLEO. We argue that the inclusive ${\eta }^{\prime }$ production in $B$ decays may dominantly come from the Cabibbo-favored $b\to (\overline{c}{c)}_{8}s$ process where the $\overline{c}c$ pair is in a color-octet configuration, and followed by the nonperturbative transition $(\overline{c}{c)}_8\to {\eta }^{\prime }X.\mathrm{}$ The color-octet intrinsic charm component in the higher Fock states of ${\eta }^{\prime }$ is crucial and is induced by the strong coupling of ${\eta }^{\prime }$ to gluons via the QCD axial anomaly.