B → Kη ( ′ ) decay in perturbative QCD

We compute B → Kη (′) branching ratio using perturbative QCD approach. We show that a triangular relation among amplitudes for B 0 → K 0 π 0 , B 0 → K 0 η, B 0 → K 0 η ′ receives large corrections from SU(3) breaking effects. If experimental value will come closer to the lower limit of the present BELLE data there will be a possibility to understand the large branching ratio of B 0 → K 0 η ′. Otherwise, we perhaps need to modify our understanding of η ′ meson, for example, inclusion of a possible admixture of gluonium state.