Discovery of the doubly charmed Tcc+ state implies a triply charmed Hccc hexaquark state

The doubly charmed exotic state T-cc recently discovered by the LHCb Collaboration could well be a DD* molecular state long predicted in various theoretical models, in particular, the DD* isoscalar axial vector molecular state predicted in the one-boson-exchange model. In this work, we study the DDD* system in the Gaussian expansion method with the DD* interaction derived from the one-boson-exchange model and constrained by the precise binding energy of 273 +/- 63 keV of T-cc with respect to the D*+D-0 threshold. We show the existence of a DDD* state with a binding energy of a few hundred keV, isospin 1/2, and spin-parity 1(-). Its main decay modes are DDD pi and DDD gamma. The existence of such a state could in principle be confirmed with the upcoming LHC data and will unambiguously determine the nature of the T-cc(+) state and of the many exotic states of similar kind, thus deepening our understanding of the nonperturbative strong interaction.

Automated summary

The paper investigates the recently discovered doubly charmed exotic state T-cc and suggests that it could be a molecular state predicted in theoretical models. The study presents a potential DDD* state and its main decay modes.