Synthesis and properties of shape memory water-borne epoxy and its nanocomposites (形状記憶水性エポキシ及びそのナノコンポジットの創製と性能評価に関する研究)

信州大学(Shinshu university)博士（工学）ThesisDONG YUBING. Synthesis and properties of shape memory water-borne epoxy and its nanocomposites (形状記憶水性エポキシ及びそのナノコンポジットの創製と性能評価に関する研究). 信州大学, 2015, 博士論文. 博士（工学）, 甲第642号, 平成27年9月30日授与.doctoral thesi

Decay width of d∗(2380)→NNπd^*(2380) \to NN \pi process in a chiral constituent quark model

The width of three-body single-pion decay process $d^*\to NN\pi^{0,\pm}$ is calculated by using the $d^*$ wave function obtained from our chiral SU(3) constituent quark model calculation. The effect of the dynamical structure on the width of $d^*$ is taken into account in both the single $\Delta\Delta$ channel and coupled $\Delta\Delta+CC$ two-channel approximations. Our numerical result shows that in the coupled-channel approximation, namely, the hidden-color configuration being considered, the obtained partial decay width of $d^*\to NN\pi$ is about several hundred $\rm {KeV}$, while in the single $\Delta\Delta$ channel it is just about $2\sim 3~\rm{MeV}$. We, therefore, conclude that the partial width in the single-pion decay process of $d^*$ is much smaller than the widths in its double-pion decay processes. Our prediction may provide a criterion for judging different interpretations of the $d^*$ structure, as different pictures for the $d^*$ may result quite different partial decay width.Comment: 6 pages, 1 figure, and 1 table, typos correcte

Selected strong decays of pentaquark State Pc(4312)P_c(4312) in a chiral constituent quark model

The newly confirmed pentaquark state $P_c(4312)$ has been treated as a weakly bound $(\Sigma_c\bar{D})$ state by a well-established chiral constituent quark model and by a dynamical calculation on quark degrees of freedom where the quark exchange effect is accounted for. The obtained mass $4308$ MeV agrees with data. In this work, the selected strong decays of the $P_c(4312)$ state are studied with the obtained wave function. It is shown that the width of the $\Lambda_c\bar{D}^*$ decay is overwhelmed and the branching ratios of the $p\,\eta_c$ and $p\,J/\psi$ decays are both less than 1 percentage.Comment: 13 pages, 2 figures, 3 table