论文标题
tetraquarks中紧凑和分子结构之间的相互作用
The interplay between compact and molecular structures in tetraquarks
论文作者
论文摘要
由于多Quark运算符的簇降低了，因此在紧凑的结构之间存在强烈的相互作用，这是由作用在夸克和胶子上的直接限制力以及由中间簇支配的分子结构所产生的。在有效的现场理论方法中研究了这个问题，在该方法中，紧凑的四夸克被视为基本粒子。分析的关键成分是由紧凑型四夸克与两个介体簇的主要耦合常数提供的。在这种耦合的影响下，最初形成的紧凑型四夸克结合状态朝着新结构演变而成，那里也存在分子构型。在强耦合极限中，进化可能以分子类型的浅结合状态结束。 QCD的大$ N_C $属性也支持强耦合体制。紧凑型和分子结构之间的相互作用可以自然地解释许多浅层状态的存在。
Due to the cluster reducibility of multiquark operators, a strong interplay exists in tetraquarks between the compact structure, resulting from the direct confining forces acting on quarks and gluons, and the molecular structure, dominated by the mesonic clusters. This issue is studied within an effective field theory approach, where the compact tetraquark is treated as an elementary particle. The key ingredient of the analysis is provided by the primary coupling constant of the compact tetraquark to the two mesonic clusters. Under the influence of this coupling, an initially formed compact tetraquark bound state evolves towards a new structure, where a molecular configuration is also present. In the strong-coupling limit, the evolution may end with a shallow bound state of the molecular type. The strong-coupling regime is also favored by the large-$N_c$ properties of QCD. The interplay between compact and molecular structures may provide a natural explanation of the existence of many shallow bound states.
