Fully-heavy tetraquark spectra and production at hadron colliders

TL;DR

This paper investigates fully-heavy tetraquark spectra using theoretical models, explains the observed $X(6900)$ as an excited state, predicts new structures, and calculates their production cross-sections at hadron colliders.

Contribution

It provides a theoretical analysis of fully-heavy tetraquark states, explaining experimental observations and predicting new states with their production rates.

Findings

$X(6900)$ can be a radially excited $cc\bar{c}\bar{c}$ state

Predicted new structures around 6.0, 6.5, and 7.1 GeV

Calculated production cross-sections for fully-heavy tetraquarks

Abstract

Motivated by the observation of exotic structure around 6900MeV in the $J/\psi$-pair mass spectrum using proton-proton collision data by the LHCb collaboration, we study the spectra of fully-heavy tetraquarks within Bethe-Salpeter equation and Regge trajectory relation. The $X(6900)$ may be explained as a radially excited state with quark content $cc\bar{c}\bar{c}$ and spin-parity $0^{++}(3S)$ or $2^{++}(3S)$ or an orbitally excited $2P$ state. New $cc\bar{c}\bar{c}$ structures around 6.0GeV, 6.5GeV, and 7.1GeV are predicted together. Other $bb\bar{b}\bar{b}$ and $bc\bar{b}\bar{c}$ structures which may be experimentally prominent are discussed. On the other hand, the fully-heavy S-wave tetraquark productions at hadron colliders are investigated and their cross-sections are obtained.