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On the Evaluation of Threshold Effects in Processes Involving Heavy Quarks

A detailed evaluation is presented of production of heavy fermions (particularly ttbar quarks) by a vector current, in the region around threshold. This includes bound states as well as the region above threshold, to the same degree of accuracy; in both cases radiative and nonperturbative corrections are included. The contribution of this region to the vacuum polarization (``threshold effects'') is calculated and compared with a perturbative calculation; the importance of the threshold effects is found substantially smaller than claimed by some authors. Open fermion-antifermion production is also discussed.

preprint1993arXivOpen access
F. J. Yndurain
hep-ph
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F. J. Yndurain

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