| Sumario: | Particle Physics is currently best described by the Standard Model. Within this framework, the interaction between quarks and gluons is characterized by the theory of Quantum Chromodynamics (QCD). Hadrons can be formed by combining quarks and gluons through strong interaction. However, these interactions happen typically at low energies and, unlike the other theories in the Standard Model, QCD can be only calculated perturbatively at high energies. As a consequence, to describe this non-perturbative regime one has to apply other approaches, like lattice QCD (LQCD), scattering theory, effective theories... In this thesis, special attention will be given to molecular resonances that result from the interaction between two hadrons, which will be described using a combination of non-perturbative resummations and effective theories. In particular we will focus on resonances containing one heavy quark.
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