Isospin breaking effects in the X(3872) resonance

In this paper we study the effects of isospin breaking in the dynamical generation of the X(3872) state. We also calculate the ratio of the branching fractions of the X decaying into J/Sigma with two and three pions, which has been measured experimentally to be close to unity. Together with the X(3872), of positive C parity, we predict the existence of a negative C-parity state, and we comment on which decay channel is more promising to observe this state. The simultaneous investigation of the X(3872) decay into J/Sigma pi pi and (DD*0)-D-0 show a preference for a slightly unbound, virtual state of DD* and DD*.