MOMENTUM DISTRIBUTIONS IN T(T)OVER-BAR PRODUCTION AND DECAY NEAR-THRESHOLD .2. MOMENTUM-DEPENDENT WIDTH

We apply the Green function formalism for t - tBAR production and deca y near threshold in a study of the effects due to the momentum depende nt width for such a system. We point out that these effects are likely to be much smaller than expected from the reduction of the available phase space. The Lippmann-Schwinger equation for the QCD chromostatic potential is solved numerically for S partial wave. We compare the res ults on the total cross section, top quark intrinsic momentum distribu tions and on the energy spectra of W bosons from top quark decays with those obtained for the constant width.