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Doubly heavy tetraquark resonant states
Physics Letters B ( IF 4.3 ) Pub Date : 2021-11-26 , DOI: 10.1016/j.physletb.2021.136800
Qi Meng 1 , Masayasu Harada 2, 3, 4 , Emiko Hiyama 4, 5, 6, 7 , Atsushi Hosaka 4, 6, 7 , Makoto Oka 4, 6
Affiliation  

Spectrum of the doubly heavy tetraquarks, bbq¯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 BB and BB thresholds. Their structures are studied and are interpreted by the quark dynamics. A narrow resonance with spin-parity JP=1+ is found to be a mixed state of a compact tetraquark and a BB scattering state. This is driven by a strong color Coulombic attraction between the bb quarks. Negative-parity excited resonances with JP=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.



中文翻译:

双重四夸克共振态

双重四夸克的光谱, q¯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=1+ 被发现是致密四夸克和 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=0-, 1-2-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。

更新日期:2021-11-30
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