Spectrum of the doubly heavy tetraquarks, $bb\overline{q}\overline{q}$, is studied in a constituent quark model. Four-body problem is solved in a variational method where the real scaling technique is used to identify resonant states above the fall-apart decay thresholds. In addition to the two bound states that were reported in the previous study we have found several narrow resonant states above the $B{B}^{⁎}$ and $B^{⁎}{B}^{⁎}$ thresholds. Their structures are studied and are interpreted by the quark dynamics. A narrow resonance with spin-parity $J^P=1^{+}$ is found to be a mixed state of a compact tetraquark and a $B^{⁎}{B}^{⁎}$ scattering state. This is driven by a strong color Coulombic attraction between the bb quarks. Negative-parity excited resonances with $J^P=0^{-}$, $1^{-}$ and $2^{-}$ form a triplet under the heavy-quark spin symmetry. It turns out that they share a similar structure to the λ-mode of a singly heavy baryon as a result of the strongly attractive correlation for the doubly heavy diquark.

双重四夸克的光谱， $乙乙\overline{q}\overline{q}$, 在成分夸克模型中进行研究。四体问题在变分方法中得到解决，其中使用实际缩放技术来识别高于分离衰减阈值的共振状态。除了先前研究中报道的两个束缚态之外，我们还发现了几个窄共振态$乙{乙}^{⁎}$ 和 ${乙}^{⁎}{乙}^{⁎}$阈值。它们的结构被研究并由夸克动力学解释。与自旋平价的窄共振$J^{磷}=1^{+}$ 被发现是致密四夸克和 ${乙}^{⁎}{乙}^{⁎}$散射状态。这是由bb夸克之间强烈的颜色库仑吸引力驱动的。负奇偶激发共振$J^{磷}=0^{-}$, $1^{-}$ 和 $2^{-}$在重夸克自旋对称下形成三重态。事实证明，由于双重二夸克的强烈吸引力相关性，它们与单重重子的λ模式具有相似的结构。