Installing FeynArts is just as the same as FeynCalc. Download it from www.feynarts.de, put the folder in \Program Files\Wolfram Research\Mathematica\5.0\AddOns\Applications, and then type <<HighEnergyPhysics`FeynCalc` and <<FeynArts`FeynArts`. Next, you can generate Feynman diagrams and amplitudes using functions in FeynArts. Finally, use functions in FeynCalc to handle these amplitudes.
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