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→K(∗)η′, B→η′Xs, where Xs 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→η′(η)K and B→Kπ for appropriate choice of form factors but cannot explain the large quasi-inclusive rate.