$d^*$是六夸克主导奇异态的候选者吗？
Is $d^*$ a candidate of hexaquark-dominated exotic state?
摘要：
我们用$I(J^P)=0(3^+)$ [Phys.Rev.C60，045203（1999）]证实了我们以前对$d^*$态的预言，并基于微观计算首次报道了$d^*$是一个六夸克主导的奇异态，因为它具有约2/3的隐色（CC）组态。在手征夸克模型中，利用共振群方法（RGM）对$ΔΔ$系统进行了详细的动力学耦合道研究，发现$d^*$态的质量约为2.38-2.42 GeV，均方根半径（RMS）约为0.76-0.88 fm，CC分数约为66%-68%。最后一个保证了$d^*$具有相当窄的宽度，连同量子数和我们计算的质量，与WASA-at-COSY协作组报道的在双介子聚变反应中新观察到的共振类结构（$M\approx 2380$ MeV，$Γ\approx 70$ MeV）一致。
英文摘要：
We confirm our previous prediction of a $d^*$ state with $I(J^P)=0(3^+)$ [Phys. Rev. C 60, 045203 (1999)] and report for the first time based on a microscopic calculation that $d^*$ is a hexaquark dominated exotic state as it has about 2/3 hidden color (CC) configurations. By performing a more elaborate dynamical coupled-channels investigation of the $ΔΔ$-CC system within the framework of resonating group method (RGM) in a chiral quark model, we found that the $d^*$ state has a mass of about 2.38-2.42 GeV, a root-mean-square radius (RMS) of 0.76-0.88 fm, and a CC fraction of 66%-68%. The last ensures that the $d^*$ has a rather narrow width which, together with the quantum numbers and our calculated mass, is consistent with the newly observed resonance-like structure ($M\approx 2380$ MeV, $Γ\approx 70$ MeV) in double-pionic fusion reactions reported by WASA-at-COSY Collaboration.
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