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In this note we first introduce the theoretical formalism of the unitarization of the two-body scattering both in the infinite and finite volumes. Then we apply this formalism to the study of the $Z_c(3900)$ resonance in the $J/\psi\,\pi$ and $D\bar{D}^{*}$ coupled-channel scattering. The recent lattice finite-volume spectra are confronted with our predictions.

Exploratory study of the coupled-channel scattering in finite volume and the Zc(3900) resonance

Exploratory study of the coupled-channel scattering in finite volume and the Z_c(3900) resonance