2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/139176I briefly review the properties of the hidden charm meson X(3872), discussing some puzzling aspects concerning its theoretical interpretation.LaTeX, 5 pages, 2 figures, talk given at IFAE 2007, Naples, Italy, 11-13 AprilHigh Energy Physics - Phenomenologytext