Hadronic Molecules: Theory

Abstract

Since the turn of the century it becomes evident that the naive quark model is not capable to describe the rich phenomenology of hadrons, especially in the doubly heavy sector. For a large number of those states a molecular structure appears to be a natural description. In these proceedings I review the theory of hadronic molecules, how they can be described systematically in effective field theories and what imprint this structure leaves in observables. On two examples I explain non-trivial predictions emerging from the molecular hypothesis that can be tested in future experiments and lattice QCD calculations, promising deep insights into the inner workings of QCD.