在我们的手征夸克模型下，计算了$\ds\to d π^0π^0$和$\ds\to d π^+π^-$过程的衰变宽度。通过使用各种衰变通道之间的截面的实验比率，还提取了$\ds\to pn π^0π^0$、$\ds\to pn π^+π^-$、$\ds\to pp π^0π^-$和$\ds\to nn π^+π^0$通道的部分宽度。进一步包括$\ds\to pn $过程的估计部分宽度，获得$\ds$共振的总宽度。在实际计算的第一步中，在单$ΔΔ$通道近似下研究了动力学结构对$\ds$宽度的影响。结果发现，与只考虑运动学效应的结果相比，该宽度减小了几十MeV。这从动力学结构上说明了这种影响的重要性。然而，用单$ΔΔ$通道波函数获得的宽度仍然太大而不能解释数据。这意味着$\ds$共振将不仅仅由$ΔΔ$结构组成，而是应该有足够的空间用于其他结构，例如隐藏颜色（CC）分量。因此，在第二步骤中，通过使用在谐振群方法（RGM）的框架中的耦合$ΔΔ$和CC信道计算中获得的波函数来进一步评估$\ds$的宽度。计算结果表明，$\ds$共振态的总宽度约为69 MeV，与实验观测的75 MeV一致，证明了$\ds$共振态是六夸克主导的奇异态.
英文摘要：
The decay widths of the $\ds\to d π^0π^0$ and $\ds\to d π^+π^-$ processes are explicitly calculated in terms of our chiral quark model. By using the experimental ratios of cross sections between various decay channels, the partial widths of the $\ds\to pn π^0π^0$, $\ds\to pn π^+π^-$, $\ds\to pp π^0π^-$, and $\ds\to nn π^+π^0$ channels are also extracted. Further including the estimated partial width for the $\ds\to pn $ process, the total width of the $\ds$ resonance is obtained. In the first step of the practical calculation, the effect of the dynamical structure on the width of $\ds$ is studied in the single $ΔΔ$ channel approximation. It is found that the width is reduced by few tens of MeV, in comparison with the one obtained by considering the effect of the kinematics only. This presents the importance of such effect from the dynamical structure. However, the obtained width with the single $ΔΔ$ channel wave function is still too large to explain the data. It implies that the $\ds$ resonance will not consist of the $ΔΔ$ structure only, and instead there should be enough room for other structure such as the hidden-color (CC) component. Thus, in the second step, the width of $\ds$ is further evaluated by using a wave function obtained in the coupled $ΔΔ$ and CC channel calculation in the framework of the Resonating Group Method (RGM). It is shown that the resultant total width for $\ds$ is about 69 MeV, which is compatible with the experimental observation of about 75 MeV and justifies our assertion that the $\ds$ resonance is a hexaquark-dominated exotic state.
Dynamical properties and secondary decay effects of projectile fragmentation in 107,124Sn + 120Sn collisions at 600 MeV/nucleon
用同位旋相关的量子分子动力学（IQMD）模型研究了600 MeV/核子的107，124 Sn +120 Sn碰撞中的旁观者的形成和碎裂过程。在动力学演化过程中，采用最小生成树算法和平行运动量与横向运动量之比来识别平衡弹丸旁观者。二次衰变对碎裂观测值的影响进行了研究，进行计算和不统计代码GEMINI。通过比较计算的产物产率和相关性与ALADIN合作研究的反应的实验结果的理论方法的有效性进行检查。
