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In this contribution we study heavy meson-antimeson molecules from the effective field theory perspective. In particular, we are concerned with the role of the one pion exchange interaction and heavy quark spin symmetry in the description of molecular states. As we will show, one pion exchange is in general a perturbative effect. This means that at lowest order we can describe the molecular states in terms of contact interactions only, a remarkable simplification. The application of heavy quark spin symmetry will be very interesting, as we will be able to predict new heavy meson-antimeson bound states from known ones. For instance, if we assume that the X(3872) is in fact a JPC = 1++ DD/DD molecule, we can predict the existence of a JPC = 2++ DD molecular partner with a mass of 4012MeV. Futher heavy quark spin symmetry partners, up to six, can be derived from the additional assumption that the X(3915) is also a DD bound state.

Heavy Meson-Antimeson Molecules in Effective Field Theory: the Role of One Pion Exchange and Heavy Quark Spin Symmetry