V-STRUCTURE AND A-STRUCTURE OF T(T)OVER-BARZ VERTEX AND TOP-QUARK POLARIZATION - QCD CORRECTIONS

We calculate the energy distributions of leptons in semileptonic decay of t quarks in the process e(-) + e(+) --> Z, gamma --> t + (t) over bar --> bW(+) + (b) over bar W- --> bl(+) nu + (b) over bar l(-) <(nu) over bar>, by taking into account the polarizations and spin-spin corr elations of t and (t) over bar quarks with QCD corrections to the t (t ) over bar Z and t (t) over bar gamma vertices up to the order alpha(s ). The corrections are large to the t quark production cross-section b ut do not alter the energy distributions of final leptons of the parto n model practically. The distributions will provide useful information about the V and A structures of t quark.