Molecular aspects of charm physics

We study the influence of possible molecular structures in the charmonium spectrum. We focus on the 0++, 1++ and 1−− sectors. In the first one we coupled the 23P0cc pair with DD, J/ψω, DsDs and J/ψφ channels and we obtain two states compatibles with the X(3945) and the Y(3940). In the second one we couple the 23P1cc state with the DD* channel and we obtain a dressed state compatible with the X(3940) and a new state that we assign to the X(3872). In the third one we include the 33S1 and 23D1 charmonium states coupled to DD, DD*, D*D*, DsDs, DsD*s and D*sD*s. In this calculation we obtain a new molecular state that could be the G(3900) or the controversial Y(4008) and two cc states dressed by the molecular components assigned to the ψ(4040) and the ψ(4160). Finally we perform a calculation in the five quark sector where we can describe the Λc(2940)+ as a ND* molecular state and predict a Λb(6248)+ state.