Decay width of d*(2380 ) →N N π π processes

The decay widths of four-body double-pion decays d^*→p n π⁰π⁰ ,d^*→p n π⁺π^- , and isoscalar parts of d^*→p p π⁰π^- and d^*→n n π⁺π⁰ are explicitly calculated with the help of the d^* wave function obtained in a chiral SU(3) quark model calculation. The effect of the dynamical structure on d^*'s width is analyzed both in the single Δ Δ channel and the Δ Δ +C C coupled-channel approximations. It is found that in the latter case, the obtained partial decay widths of d^*→p n π⁰π⁰ ,d^*→p n π⁺π^- , and those of d^* to the isoscalar parts of p p π⁰π^- and n n π⁺π⁰ are about 9.6 MeV ,20.6 MeV ,3.5 MeV and 3.5 MeV , respectively. As a consequence, the total width is about 71.9 MeV . These widths are consistent with our previous estimation by using cross section data and observed width. Apparently, the resultant mass and width in the Δ Δ +C C coupled-channel calculation again support our assertion that the d^* resonance is a six-quark dominated exotic state.