All Heavy Tetraquarks: The Dynamical Diquark Model and Other Approaches

Abstract

The 2020 announcement by LHCb of a narrow structure $X(6900)$ in the di-$J/\psi$ spectrum -- a potential $c\bar{c}c\bar{c}$ state -- has opened a new era in hadronic spectroscopy. In this talk, we briefly survey theory works preceding this event, examine key features of the observed spectrum, and then discuss how subsequent theory studies (including with the author's own dynamical diquark model) have interpreted these features. We conclude with proposals for experiments capable of distinguishing competing interpretations.

7 pages, 1 figure. Invited talk at the 20th Lomonosov Conference on Elementary Particle Physics, 19-25 Aug. 2021

References in corpus (7)

• Insights into the inner structures of the fully charmed tetraquark state $X(6900)$
• Is the existence of a $J/\psi J/\psi$ bound state plausible?
• Spectrum of the Hidden-Bottom and the Hidden-Charm/Strange Exotics in the Dynamical Diquark Model
• Spectroscopy of Exotic Hadrons Formed from Dynamical Diquarks
• Hunting for tetraquarks in ultra-pheripheral heavy ion collisions
• A possible interpretation for $X(6900)$ observed in four-muon final state by LHCb -- A light Higgs-like boson?
• About the $J/\psi J/\psi$ peak of LHCb: fully-charmed tetraquark?