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In this article, we test the nature of X(3872), which is assumed to be a P-wave -scalar-diquark -axial-vector-antidiquark tetraquark state with . The interpolating current representing the state is proposed. Technically, contributions of the operators up to dimension six are included in the operator product expansion (OPE). The mass obtained for such state is . We conclude that it is impossible to describe the X(3872) structure as tetraquark state.

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