Fully-heavy tetraquark spectra and production at hadron colliders

Motivated by the observation of exotic structure around 6900 MeV 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 (c) over bar(c) over bar and spin-parity 0++(3S) or 2(++)(3S) or an orbitally excited 2P state. New cc (c) over bar(c) over bar structures around 6.0 GeV, 6.5 GeV, and 7.1 GeV are predicted together. Other bb (b) over bar(b) over bar and bc (b) over bar(c) over bar structures which may be experimentally prominent are discussed. On the other hand, the fully-heavy S-wave tetraquark production at hadron colliders is investigated and their cross sections are obtained. (C) 2021 The Author(s). Published by Elsevier B.V.

Automated summary

The study focused on exotic structures observed around 6900 MeV in J/psi-pair mass spectrum, investigating the spectra of fully-heavy tetraquarks and predicting new structures at different energy levels. The production of fully-heavy S-wave tetraquarks at hadron colliders was also explored, obtaining their cross sections.