Abstract: | The width of S-wave quarkonium decays ( c, b ; ![gamma](/content/n12m6836h8515462/xxlarge947.gif) and J/ , Y e+e–) are calculated using the quasipotential approach. The nontrivial dependence of decay amplitude on relative quark momentum is considered. It is shown that relativistic corrections reach values of 30–50% in the processes studied.Samara State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 46–53, May, 1995. |