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

TL;DR

This paper uses QCD sum rules to analyze vector and axialvector heavy tetraquark states, calculating their masses and revealing their typical energetic features compared to other tetraquark states.

Contribution

It constructs specific currents to study heavy tetraquark states and provides mass predictions, advancing understanding of their structure and properties.

Findings

Masses of various $QQ\bar{Q}\bar{Q}$ tetraquark states are calculated.

Vector tetraquark states are about 40 MeV above other tetraquark centroids.

The study confirms typical features of heavy tetraquark states with four heavy quarks.

Abstract

In this article, we construct the axialvector-diquark-axialvector-antidiquark type currents to study both the vector and axialvector $QQ\bar{Q}\bar{Q}$ tetraquark states with the QCD sum rules, and obtain the masses $M_{Y(cc\bar{c}\bar{c},1^{+-})} =6.05\pm0.08\,\rm{GeV}$, $M_{Y(cc\bar{c}\bar{c},1^{--})} =6.11\pm0.08\,\rm{GeV}$, $M_{Y(bb\bar{b}\bar{b},1^{+-})} =18.84\pm0.09\,\rm{GeV}$, $M_{Y(bb\bar{b}\bar{b},1^{--})} =18.89\pm0.09\,\rm{GeV}$. The vector tetraquark states lie $40\,\rm{MeV}$ above the corresponding centroids of the $0^{++}$, $1^{+-}$ and $2^{++}$ tetraquark states, which is a typical feature of the vector tetraquark states consist of four heavy quarks.