Effect of the KKˉ and ηη channels and interference phenomena in the two-pion and KKˉ transitions of charmonia and bottomonia

摘要

It is shown that the basic shape of dipion and KKˉ mass spectra in decays J/ψ→?(ππ,KKˉ), ψ(2S)→J/ψππ, Y(4260)→J/ψππ and in the two-pion transitions of bottomonia states are explained by an unified mechanism based on the contribution of the ππ, KKˉ and ηη coupled channels including their interference. The role of the individual f0 resonances in making up the shape of the dipion mass distributions in the charmonia and bottomonia decays is considered.