MOMENTUM DISTRIBUTIONS IN tt̄ PRODUCTION AND DECAY NEAR THRESHOLD (II): MOMENTUM DEPENDENT WIDTH

We apply the Green function formalism for t − t̄ production and decay near threshold in a study of the effects due to the momentum dependent 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 results on the total cross section, top quark intrinsic momentum distributions and on the energy spectra of W bosons from top quark decays with those obtained for the constant width. Alexander von Humboldt Foundation Fellow. Permanent address: Institute of Nuclear Physics, Kraków, Poland; e–mail: [email protected] and [email protected] e–mail: [email protected]