Investigating the underlying structure of vector hidden-charm tetraquark states via their electromagnetic characteristics

TL;DR

This paper calculates the magnetic moments of vector hidden-charm tetraquark states using QCD light-cone sum rules, aiming to reveal their internal quark-gluon structure and distinguish between different tetraquark configurations.

Contribution

It provides the first detailed analysis of magnetic moments for these tetraquark states considering multiple diquark-antidiquark structures, highlighting their potential to uncover internal configurations.

Findings

Significant differences in magnetic moments depending on diquark-antidiquark structure.

Magnetic moments can serve as probes for the internal quark-gluon structure.

Individual quark contributions help understand the internal composition.

Abstract

Accessing a full picture of the internal structure of hadrons would be a key topic of hadron physics, with the main motivation to study the strong interaction binding the visible matter. Furthermore, the underlying structure of known exotic states remains an unresolved fundamental issue in hadron physics, which is currently being addressed by hadron physics community. It is well known that electromagnetic characteristics can serve as a distinguishing feature for states whose internal structures are complex and not yet fully understood. The aim of this study is to determine the magnetic moments of vector hidden-charm tetraquark states by making use of QCD light-cone sum rules. In order to achieve this objective, the states mentioned above are considered in terms of the diquark-antidiquark structure. Subsequently, a comprehensive examination is conducted, with four distinct interpolating currents being given particular consideration, as these have the potential to couple with the aforementioned states. It has been observed that there are considerable discrepancies between the magnetic moment results extracted employing different diquark-antidiquark structures. Such a prediction may be interpreted as the possibility of more than one tetraquark with the identical quantum numbers and similar quark constituents, but with different magnetic moments. The numerical predictions yielded have led to the conclusion that the magnetic moments of the vector hidden-charm tetraquark states are capable of projecting the inner structure of these states, which may then be used to determine their quark-gluon structure and quantum numbers. In order to provide a comprehensive analysis, the individual quark contributions to the magnetic moments are also examined.