2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48648To include the explicit valence gluon degrees of freedom into spectroscopy of the lowest states of heavy quarkonia, we consider, within an adiabatic model, the properties of the lowest hybrid $\bar{Q}Qg$-mesons and estimate the effects of their mixing with low-lying vector $\bar{c}c$-charmonia. The perspectives of compatibility of the resulting picture with data are discussed.LaTex, 5 pages, no figures; Talk at the XIth International Conference on Problems of Quantum Field Theory, dedicated to 90th anniversary of Professor D.I. Blokhintsev, Joint Institute for Nuclear Research, Dubna, Russia, July 13-17, 1998High Energy Physics - Phenomenologytext