AUTOMATIC CALCULATIONS IN HIGH ENERGY PHYSICS BY GRACE AND COMPHEP

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Abstract
Ten three-body processes in e+e− collisions for heavy particle productions such as Higgs, t-quark, W± and Z0 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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