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Quasi-Inclusive and Exclusive decays of $B $ to $η'$

We consider the effective Hamiltonian of four quark operators in the Standard Model in the exclusive and quasi-inclusive decays of the type $B\to K^{(*)} η^{\prime}$, $B\to η' X_s$, where $X_s$ contains a single Kaon. Working in the factorization assumption we find that the four quark operators can account for the recently measured exclusive decays $B\to η^{\prime}(η) K$ and $B\to K π$ for appropriate choice of form factors but cannot explain the large quasi-inclusive rate.