We show that it is necessary to go beyond a single hadron (beyond the quark‐antiquark or three‐quark systems) in order to distinguish the colour structure of the effective quark‐quark interaction and the relevance of 3‐body forces. We critically discuss the proposed models which suggest the dimeson bbu¯d¯ to be bound by ∼ 100 MeV and the ccu¯d¯ dimeson to be unbound. Only experiment can judge. We estimate the probability of producing bbu¯d¯ at LHC by double gluon‐gluon fusion and search for a characteristic decay. © 2003 American Institute of Physics