# Analysis of the $QQ\bar{Q}\bar{Q}$ tetraquark states with QCD sum rules

## TL;DR

This paper uses QCD sum rules to predict the masses of specific fully heavy tetraquark states with different quantum numbers, providing theoretical benchmarks for future experimental verification.

## Contribution

It presents novel mass predictions for $QQ\bar{Q}\bar{Q}$ tetraquark states with $J^{PC}=0^{++}$ and $2^{++}$ using QCD sum rules, and discusses their internal structure as superpositions of meson-meson pairs.

## Key findings

- Predicted masses: 5.99 GeV and 6.09 GeV for $cc\bar{c}\bar{c}$ states.
- Predicted masses: 18.84 GeV and 18.85 GeV for $bb\bar{b}\bar{b}$ states.
- Tetraquark states can be viewed as superpositions of meson-meson pairs.

## Abstract

In this article, we study the $J^{PC}=0^{++}$ and $2^{++}$ $QQ\bar{Q}\bar{Q}$ tetraquark states with the QCD sum rules, and obtain the predictions $M_{X(cc\bar{c}\bar{c},0^{++})} =5.99\pm0.08\,\rm{GeV}$, $M_{X(cc\bar{c}\bar{c},2^{++})} =6.09\pm0.08\,\rm{GeV}$, $M_{X(bb\bar{b}\bar{b},0^{++})} =18.84\pm0.09\,\rm{GeV}$ and $M_{X(bb\bar{b}\bar{b},2^{++})}=18.85\pm0.09\,\rm{GeV}$, which can be confronted to the experimental data in the future. Furthermore, we illustrate that the diquark-antidiquark type tetraquark state can be taken as a special superposition of a series of meson-meson pairs and embodies the net effects.