Abstract
The complete tree-level cross sections for the reaction e +e− →e?tb are computed for top masses of 160 to 200 GeV at center-of-mass energies between 0.2 and 2.0 TeV using the packages CompHEP and GRACE. It is demonstrated that tt -pair production dominates around $sqrt s=0.5$ TeV, whereas soft photon t-channel exchange contributions grow with increasing energy such that above 1.5 TeV it dominates. Detailed cross section considerations close to the tt threshold reveals some peculiar properties. It is shown that a precise top quark mass determination is not significantly hampered by the existence of non-tt diagrams. With desirable assumptions on linear collider luminosities the CKM matrix element | V tb | might be measured best at or close to $sqrt s=2$ TeV.
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