Abstract
The q q ¯ c c ¯ systems are investigated by a quark model with the quark correlation, which has successfully described baryon and meson mass spectra. The results show that there can be a bound state of q q ¯ c c ¯ isospin 1, J P C = 1 + + . This state is considered as a coupled state of the J / ψ - ρ and D - D * molecules. The size of the DD * component is smaller because the quark interaction is more attractive. We argue that this state can be X(3872).
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