“…Nowadays this phenomenon is discovered experimentally and studied with the help of detectors VES in Protvino [6] and BESIII in Beijing [7,9,14,27] in the reactions: [7,27], J/ψ → γη(1405) → γ f 0 (980)π 0 → γ 3π [9], and J/ψ → φ f 1 (1285) → φ f 0 (980)π 0 → φ 3π [14]. After these experiments, it has become clear [16,18,20,28] that the similar isospin breaking effects can appear not only due to the a 0 0 (980) − f 0 (980) mixing, but also for any mechanism of the production of the KK pairs with a definite isospin in the S wave: 1 Thus a new tool to study the production mechanisms and the nature of light scalars is emerged. 2 a 0 0 (980) − f 0 (980) mixing…”