论文标题
$ qq \ bar q \ bar q $ tetraquarks在相对论的diquark- antidiquark图片中
Masses of the $QQ\bar Q\bar Q$ tetraquarks in the relativistic diquark--antidiquark picture
论文作者
论文摘要
基于Quasiptential方法的相对论夸克模型的框架中，在diquark-antidiquark图片中计算了由$ c $和$ b $ c $和$ b $ quarks和Antiquarks组成的地面teraquarks的质量。夸克 - 夸克和diquark-antidiquark相互作用的准次电位与先前对介子和重子的考虑相似。假定diquark和Antidiquark在整个Tetraquark中相互作用，并考虑了diquarks的内部结构。所有这样的四夸克人都在腐烂的阈值高于两个重型夸克尼亚的阈值之上。这是考虑到diquark的结果，不是要成为点状对象。因此，可以将这种四夸克人视为巨大的结构主要腐烂到Quarkonia。 LHCB合作最近观察到的Di-$ j/ψ$质量阈值旁边的广泛结构可以对应于$ 2^{++} $ - 状态四夸克，由四个魅力夸克组成。
Masses of the ground-state teraquarks composed from heavy $c$ and $b$ quarks and antiquarks are calculated in the diquark-antidiquark picture in the framework of the relativistic quark model based on the quasipotential approach. The quasipotentials of the quark-quark and diquark-antidiquark interactions are constructed similarly to the previous consideration of mesons and baryons. It is assumed that the diquark and antidiquark interact in the tetraquark as a whole and the internal structure of the diquarks is taken into account. All such tetraquarks are found above the thresholds of decays to two heavy quarkonia. This is a result of the consideration of the diquark not to be a point-like object. Therefore such tetraquarks can be observed as broad structures decaying dominantly to quarkonia. The broad structure next to the di-$J/ψ$ mass threshold, recently observed by the LHCb Collaboration, can correspond to the ground $2^{++}$-state tetraquark consisting of four charm quarks.
