Fully-heavy tetraquarks: $bb\bar{c}\bar{c}$ and $bc\bar{b}\bar{c}$

TL;DR

This study uses a nonrelativistic chiral quark model to analyze the mass spectra of fully-heavy tetraquarks, predicting possible resonances but no bound states for specific configurations.

Contribution

It introduces a comprehensive analysis considering multiple structures and configurations, predicting resonances in fully-heavy tetraquarks with stability assessments.

Findings

No bound states for $bbar{c}ar{c}$ and $bcar{b}ar{c}$ systems.

Possible resonances identified with stability checks.

Resonances depend on color structure and mixing.

Abstract

In the framework of a nonrelativistic chiral quark model, we continue to study the mass spectra of the fully-heavy $bb\bar{c}\bar{c}$ and $bc\bar{b}\bar{c}$ tetraquarks. In the present calculations, two structures, meson-meson [$\bar{Q}Q$][$\bar{Q}Q$] and diquark-antidiquark [$QQ$][$\bar{Q}\bar{Q}$] ($Q$ = $c$ or $b$), and their mixing, along with all possible color, spin configurations are considered. The calculations suggest that no bound state can be formed for $bb\bar{c}\bar{c}$ and $bc\bar{b}\bar{c}$ systems. However, resonances are possible because of the color structure. Several resonances are predicted and their stabilities are checked using the real scaling method.