  Using the expression of the dynamical gluon mass obtained through the
operator product expansion we discuss the relevance of gluon mass effects in
the decays V -> hadrons (V = J/Psi, Upsilon). Relativistic and radiative
corrections are also introduced to calculate alpha_s(m_c) and alpha_s(m_b)
comparing them with other values available in the literature. The effects of
dynamical gluon masses are negligible for Upsilon decay but important for J/Psi
decay.
