论文标题
$ qq \ bar {q} \ bar {q} $在手性Quark模型中
$QQ\bar{q}\bar{q}$ in a chiral constituent quark model
论文作者
论文摘要
灵感来自$ξ_{cc} $由LHCB协作报告的，$ x（5568）$由$ d0 $ Collaboration报告，$ qq \ bar {q} \ bar {q} $（$ q = c，b，s $，$ q = u，$ q = u，d $）tetraquark State，tetraquark Station，tetraquark Station，在现有的工作中进行了研究。借助高斯膨胀方法，在手性夸克模型中系统地研究了两个结构，即diquark-antiquark和Meson-Meson，并系统地研究了所有可能的颜色配置，以搜索可能的稳定状态。结果表明，在ISOVECTOR $ qQ \ bar {q} \ bar {q} $系统中没有绑定状态，而Isoscalar $ bb \ bar {q} \ bar {q} $，$ cc \ bar {q}} \ bar {q} \ bar { $ qq^{\ prime} $ system中也有几个浅的绑定状态。混合了diquark-antidiquark和梅森 - 梅森的两个结构可以引入更多的景点，并将一些未结合的等相状状态转换为浅层结合状态。大量的重夸克对结合状态的形成有益。计算夸克之间的分离是为了揭示系统的空间结构。
Inspired by $Ξ_{cc}$ reported by LHCb Collaboration and $X(5568)$ reported by $D0$ Collaboration, the $QQ\bar{q}\bar{q}$ ($Q=c,b,s$, $q=u,d$) tetraquark states, are studied in the present work. With the help of gaussian expansion method, two structures, diquark-antiquark and meson-meson, with all possible color configurations are investigated systematically in a chiral quark model to search for the possible stable states. The results show that there is no bound state in the isovector $QQ\bar{q}\bar{q}$ system, while there are rather deep bound states in the isoscalar $bb\bar{q}\bar{q}$, $cc\bar{q}\bar{q}$ and $bc\bar{q}\bar{q}$ systems. There are also several shallow bound states in $QQ^{\prime}$ system. Mixing two structures of diquark-antidiquark and meson-meson can introduce more attractions and convert some unbound isoscalar states into shallow bound states. The large mass of the heavy quark is beneficial to the formation of the bound state. The separations between quarks are calculated to unravel the spacial structure of the system.
