2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177630We discuss some puzzling aspects of the narrow hidden charm resonance that was recently discovered by the Belle Collaboration at mass 3872 MeV. In order to determine its quantum numbers, a crucial piece of information is the spin of the dipion in the decay final state pi^+pi^-J/psi. We give the angular distributions and correlations of the final particles in the decay which will give this information about the nature of this resonance.10 pages, 1 eps figure, and 1 Table in Revtex. A comment with two references is added on mixing between a charmonium and a moleculeHigh Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext