We explore molecular states of two open heavy-quark mesons (Qq̄)-(qQ̄) in a quark-based model in terms of a four-body nonrelativistic Hamiltonian with pairwise effective interactions. Molecular states are found in the combinations of D,D*,B,B* with D̄,D̄*,B̄,B̄*, including a weakly bound DD̄* state near the threshold which may be qualitatively identified as the 3872 state observed recently by the Belle Collaboration.
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Cheuk-Yin Wong (2004) studied this question.
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