In the quark bag model, the same gluon-exchange forces which make the proton lighter than the Δ(1236) bind six quarks to form a stable, flavor-singlet (with strangeness of - 2) JP=0⁺ dihyperon (H) at 2150 MeV. Another isosinglet dihyperon (H*) with JP=1⁺ at 2335 MeV should appear as a bump in ΛΛ invariant-mass plots. Production and decay systematics of the H are discussed.
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R. L. Jaffe (1977) studied this question.
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