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Underlying mixing of scalar mesons is studied in $\eta'\rightarrow\eta\pi\pi$ decay within a generalized linear sigma model of low-energy QCDwhich contains two nonets of scalar mesons and two nonets of pseudoscalarmesons (a quark-antiquark nonet and a four quark nonet). The model has beenpreviously employed in various investigations of the underlying mixings amongscalar mesons below and above 1 GeV (as well as those of their pseudoscalarchiral partners) and has provided a coherent global picture for the physicalproperties and quark substructure of these states. It is found that the linearsigma model with only a single lowest-lying nonet is not accurate in predictingthe decay width, but inclusion of the mixing of this nonet with thenext-to-lowest lying nonet, together with the effect of final state interactionof pions, significantly improves this prediction and agrees with experiment upto about 1\%. It is also shown that while the prediction of the leading orderof the generalized model for the Dalitz parameters is not close to theexperiment, the model is able to give a reasonable prediction of the energydependencies of the normalized decay amplitude squared and that this isexpected to improve with further refinement of the complicated underlyingmixings. Overall this investigation provides further support for the globalpicture of scalar mesons: those below 1 GeV are predominantly four-quark statesand significantly mix with those above 1 GeV which are closer to theconventional p-wave quark-antiquark states.

Chiral Nonet Mixing in $\eta' \rightarrow \eta \pi\pi$ Decay