2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81457We model J/psi using an effective lagrangian approach and calculate its spectral function in a gas of light mesons at finite temperature. We explore the hadronic landscape estimating cross sections for elastic and inelastic channels. Effects of form factors are tested in a general, but consistently gauge invariant manner. Relevance to heavy ion experiments is discussed.8 pages, Latex, 3 figures, Invited Talk at Hirschegg 2000: Hadrons in Dense Matter, International Workshop XXVIII on Gross Properties of Nuclei and Nuclear Excitations, 16--22 January 2000, Hirschegg, AustriaNuclear Theorytext