Effect of the ηη channel and interference phenomena in the two-pion transitions of charmonia and bottomonia
Abstract
The basic shape of di-pion mass spectra in the two-pion transitions of both charmonia and bottomonia states is explained by an unified mechanism based on contributions of the ππ, KK and ηη coupled channels including their interference. The role of the individual f0 resonances in shaping the di-pion mass distributions in the charmonia and bottomonia decays is considered.
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