“Quark-Level Analogue of Nuclear Fusion With Doubly-Heavy Baryons”, Marek Karliner, Jonathan L. Rosner2017-08-08 (science)⁠:

The recent discovery by LHCb of the first doubly-charmed baryon Ξ_cc⁺⁺ = ccu at 3621.40 ± 0.78 MeV implies a large binding energy ≈ 130 MeV between the two c quarks. This strong binding enables a quark-rearrangement exothermic reaction Λ_c Λ_c → Ξ_cc⁺⁺,n with Q = 12 MeV, which is a quark-level analogue of deuterium-tritium nuclear fusion reaction DT → ⁴He n.

Due to much larger binding energy between two b quarks ≈ 280 MeV, the analogous reaction with b quarks, Λ_b Λ_b → Ξ_bb N, is expected to have a dramatically larger Q-value, 138 ± 12 MeV.