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arXiv 2009.13237hep-phhep-ex
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相对论双夸克-反双夸克图象中$QQ\bar Q\bar Q$四夸克态的质量

Masses of the $QQ\bar Q\bar Q$ tetraquarks in the relativistic diquark--antidiquark picture

R. N. Faustov, V. O. Galkin, E. M. Savchenko

摘要:

在相对论夸克模型的双夸克-反双夸克图像中,基于准势方法计算了重$c$、$b$夸克和反夸克组成的基态四夸克的质量.夸克-夸克和双夸克-反双夸克相互作用的准势的构造类似于前面对介子和重子的考虑。假设双夸克和反双夸克在四夸克态中作为一个整体相互作用,并考虑了双夸克的内部结构。所有这样的四夸克都在衰变到两个重夸克偶素的阈值以上。这是考虑到双夸克不是点状物体的结果。因此,这样的四夸克可以观察到广泛的结构,主要衰变为夸克偶素。最近由LHCb合作组观测到的双$J/ψ$质量阈值附近的宽结构可以对应于由四个粲夸克组成的$2^{++}$基态四夸克态。

英文摘要:

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.

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