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arXiv · 2010.09082

Fully-heavy tetraquark spectra and production at hadron colliders

Ruilin Zhu
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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.

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Ruilin Zhu. 2020-10-18. Fully-heavy tetraquark spectra and production at hadron colliders. https://doi.org/10.1016/j.nuclphysb.2021.115393

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