Abstract
In this paper we have solved the homogeneous Lippmann-Schwinger integral equation in the momentum space by using a screened funnel potential which is suggested by unquenched lattice calculations. As an application the mass spectra of heavy quarkonia \(\mathrm {\Upsilon }(b\bar {b})\) and \(\psi (c\bar {c}))\), have been calculated. The results have been compared with non screened potentials and experimental data.
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