2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46280An effective theory approach to heavy quarkonia decays based on the $1/m_Q$ expansion is introduced. Its application to decays in which the two heavy quarks annihilate is discussed.Contribution to the III German--Russian Workshop on Heavy Quark Physics, Dubna, Russia, May 20--22, 1996 6 pages, LaTeX, no figuresHigh Energy Physics - Phenomenologytext