Ten three-body processes in e + e − collisions for heavy particle productions such as Higgs, t-quark, W ± and Z 0 are calculated by two independent computer codes for automatic calculation of Feynman amplitude. The results are in excellent agreement within statistical error of numerical integration (about 0.5%). This demonstrates that these systems are quite powerful for theoretical study for future e + e − , e ± γ and γγ colliders. Numerical values of cross sections are summarized in tables and a figure.
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Boos et al. (1994) studied this question.