On the Evaluation of Threshold Effects in Processes Involving Heavy Quarks

Details On the Evaluation of Threshold Effects in Processes Involving Heavy Quarks On the Evaluation of Threshold Effects in Processes Involving Heavy Quarks

1993-11-20

arxiv.org/abs/hep-ph/9311323v1

Phys.Lett.B321:400-406,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, preprint FTUAM 38/93

Scientific paper

10.1016/0370-2693(94)90266-6

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.

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