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In order to clarify the mechanism to cause such a large isospin violation, we investigate X(3872) employing a model of coupled-channel two-meson scattering with a ccbar core. The two-meson states consist of D0Dbar*0, D+Dbar*-, J/\\psi\\rho, and J/\\psi\\omega. The effects of the \\rho\\ and \\omega\\ meson width are also taken into account.\n  We calculate the transfer strength from the ccbar core to the final two-meson states. 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In order to clarify the mechanism to cause such a large isospin violation, we investigate X(3872) employing a model of coupled-channel two-meson scattering with a ccbar core. The two-meson states consist of D0Dbar*0, D+Dbar*-, J/\\psi\\rho, and J/\\psi\\omega. The effects of the \\rho\\ and \\omega\\ meson width are also taken into account.\n  We calculate the transfer strength from the ccbar core to the final two-meson states. 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