2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/169195The relativistic four-quark equations are found in the framework of coupled-channel formalism. The dynamical mixing of the meson-meson states with the four-quark states is considered. The four-quark amplitudes of the tetraquarks with hidden charm including u, d, s and charmed quarks are constructed. The poles of these amplitudes determine the masses and widths of tetraquarks.7 pages, the typos corrected in Table II, results unchangedHigh Energy Physics - Phenomenologytext