Abstract
We calculate production by vector and axial vector currents of heavy quark pairs (cc\ifmmode\bar\else\textasciimacron\fi{},bb\ifmmode\bar\else\textasciimacron\fi{},tt\ifmmode\bar\else\textasciimacron\fi{}) close to threshold. We take into account strong interaction contributions (including radiative corrections and leading nonperturbative effects) by using the Fermi-Watson final-state interaction theorem. We use the results obtained to compare with experiment for open production of cc\ifmmode\bar\else\textasciimacron\fi{},bb\ifmmode\bar\else\textasciimacron\fi{} near threshold, and to give a reliable estimate of the so-called ``threshold effects'' contribution to vector and axial vector correlators, for tt\ifmmode\bar\else\textasciimacron\fi{}, i.e., the contribution of regions close to 4${\mathit{m}}_{\mathit{t}}^{2}$ to \ensuremath{\Pi}(t), for small values of t (0t\ensuremath{\lesssim}${\mathit{M}}_{\mathit{Z}}^{2}$).
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