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 B0→K0π0, B0→K0η, B0→K0η′ 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 B0→K0η′. Otherwise, we perhaps need to modify our understanding of η′ meson, for example, inclusion of a possible admixture of gluonium state.