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The decay widths of four-body double-pion decays $\ds\to pn \pi^0\pi^0$,$\ds\to pn \pi^+\pi^-$, and iso-scalar parts of $\ds\to pp \pi^0\pi^-$ and$\ds\to nn \pi^+\pi^0$ are explicitly calculated with the help of the $d^*$wave function obtained in a chiral SU(3) quark model calculation. The effect ofthe dynamical structure on $\ds$'s width is analyzed both in the single$\Delta\Delta$ channel and coupled $\Delta\Delta$ and $CC$ channelapproximations. It is found that in the coupled-channel approximation, theobtained partial decay widths of $\ds\to pn \pi^0\pi^0$, $\ds\to pn\pi^+\pi^-$, and those of $d^*$ to the iso-scalar parts of $pp \pi^0\pi^-$ and$nn \pi^+\pi^0$ are about $7.4$MeV, $16.4$MeV, $3.5$MeV and $3.5$MeV,respectively As a consequence, the total width is about $64.5$MeV. These widthsare consistent with those estimated by using the corresponding cross sectiondata in our previous investigation and also the observed data. But in thesingle $\Delta\Delta$ channel approximation, the widths are still almost2-times larger than the measured values. Apparently, the explicitly calculatedwidth together with the evaluated mass of $d^*$ in the coupled $\Delta\Delta$and $CC$ channel approximation can well explain the observed data, which againsupports our assertion that the $\ds$ resonance is a six-quark dominated exoticstate.

Decay width of $d^*(2380)\to NN \pi\pi$ processes