论文标题
相对论夸克模型中完全重量的四夸克光谱
Fully-heavy tetraquark spectroscopy in the relativistic quark model
论文作者
论文摘要
地面和兴奋的群体（1p，2s，1d，2p，3s）的状态，由魅力（$ c $）和底部（$ b $）夸克和古quarks组成的完全重型的四夸克人在相对性的Quark模型中基于基于quasipotential offerential Chromodynics的diquark-antidiquark图片中计算出来。夸克 - 夸克和diquark-antidiquark相互作用的准次电位与先前对介子和重子的考虑相似。始终考虑相对论效应。 tetraquark被认为是diquark和Antidiquark的界限。使用diquark-gluon相互作用的形式，考虑了diquark的有限大小。结果表明，大多数调查的四夸克人都位于衰减阈值中，因此可以将它们仅视为广泛的共振。 LHCB，CMS和ATLAS合作的狭窄状态X（6900）最近在Di-$ j/ψ$生产范围中发现的狭窄状态X（6900）对应于完全掌握的Tetraquark的激动状态。其他最近发现的异国情调的重共振X（6200），X（6400），X（6600），X（7200），X（7300）也可以解释为完全掌握的四夸克的不同激发。
Masses of the ground and excited (1P, 2S, 1D, 2P, 3S) states of the fully-heavy tetraquarks, composed of charm ($c$) and bottom ($b$) quarks and antiquarks, are calculated in the diquark-antidiquark picture within the relativistic quark model based on the quasipotential approach and quantum chromodynamics. The quasipotentials of the quark-quark and diquark-antidiquark interactions are constructed similarly to the previous consideration of mesons and baryons. Relativistic effects are consistently taken into account. A tetraquark is considered as a bound state of a diquark and an antidiquark. The finite size of the diquark is taken into account, using the form factors of the diquark-gluon interaction. It is shown that most of the investigated states of tetraquarks lie above the decay thresholds into a meson pair, as a result they can be observed only as broad resonances. The narrow state X(6900) recently discovered in the di-$J/ψ$ production spectrum by the LHCb, CMS and ATLAS Collaborations corresponds to an excited state of the fully-charmed tetraquark. Other recently discovered exotic heavy resonances X(6200), X(6400), X(6600), X(7200), X(7300) can also be interpreted as the different excitations of the fully-charmed tetraquark.
