Y. Akatsu et O. Terazawa, V-STRUCTURE AND A-STRUCTURE OF T(T)OVER-BARZ VERTEX AND TOP-QUARK POLARIZATION - QCD CORRECTIONS, International journal of modern physics A, 12(14), 1997, pp. 2613-2622
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.