# Axial Vector $cc$ and $bb$ Diquark Masses from QCD Laplace Sum-Rules

## TL;DR

This paper predicts the masses of axial vector $cc$ and $bb$ diquarks using QCD Laplace sum-rules and employs these results to estimate tetraquark masses within a specific model.

## Contribution

It provides the first NLO QCD sum-rule calculations of axial vector diquark masses including higher-dimensional condensate effects.

## Key findings

- $cc$ diquark mass is 3.51 GeV
- $bb$ diquark mass is 8.67 GeV
- Tetraquark masses estimated using diquark inputs

## Abstract

Constituent mass predictions for axial vector (i.e., $J^P=1^+$) $cc$ and $bb$ colour antitriplet diquarks are generated using QCD Laplace sum-rules. We calculate the diquark correlator within the operator product expansion to NLO, including terms proportional to the four- and six-dimensional gluon and six-dimensional quark condensates. The sum-rules analyses stabilize, and we find that the mass of the $cc$ diquark is 3.51~GeV and the mass of the $bb$ diquark is 8.67~GeV. Using these diquark masses as inputs, we calculate several tetraquark masses within the Type-II diquark-antidiquark tetraquark model.