Tetraquarks with charm in coupled-channel formalism

Understand

The 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 approximate solutions of these equations using the method based on the extraction of leading singularities of the amplitudes are obtained.
• The four-quark amplitudes of cryptoexotic mesons including the quarks of three flavours (u, d, s) and the charmed quark are constructed.