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Achasov","submitted_at":"2015-04-11T06:41:04Z","abstract_excerpt":"There are attempts in the literature to theoretically explain the large breaking of isotopic invariance in the decay $\\eta(1405)$\\,$\\to$\\,$f_0(980)\\pi^0$\\,$\\to$\\,$ 3\\pi$ by the mechanism containing the logarithmic (triangle) singularity, i.e., as being due to the transition $\\eta(1405)\\to(K^*\\bar K+\\bar K^*K)\\to(K^+K^-+K^0\\bar K^0)\\pi^0\\to f_0(980)\\pi^0\\to3\\pi$. The corresponding calculations were fulfilled for a hypothetic case of the stable $K^*$ meson. 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