2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37746Recent experimental results on heavy quarkonia spectroscopy and decays are reviewed. In particular, new results are discussed on charmonium spin singlet states, bottomonium D-states, photon and hadronic transitions from heavy quarkonium states, and the unexplained narrow X(3872) state.10 pages, 6 figures. Talk given at Heavy Quarks and Leptons 2004, San Juan, Puerto Rico, June 1-5, 2004High Energy Physics - Experimenttext