2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/116235The molecule and the tetraquark model are the two competing interpretations of the X(3872). I will briefly comment on how far these two pictures are really resolvable by the experiment, and I will give a concise account on a new method for defining the quark content of hadrons at heavy-ion colliders.6 pages, to appear in the Proceedings of IFAE2006, Pavia, ItalyHigh Energy Physics - Phenomenologytext