The qq-qq system has been examined by solving the four-particle Schr\"odinger equation variationally. The main findings are that (1) qq-qq bound states normally do not exist, (2) the cryptoexotic 0⁺⁺ sector of this system with KK̄ quantum numbers is probably the only exception to (1) and its bound states can be identified with the S* and δ just below KK̄ threshold, (3) qq-qq bound states provide a model for the weak binding and color-singlet clustering observed in nuclei, and (4) there is no indication that this system has strong resonances.
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Weinstein et al. (1982) studied this question.
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