MENLO_PARC, a program for e+e- -> 4 jets at next-to-leading order. Nature of problem: The expansion in the strong coupling constant of any four-jet quantity in electron-positron annihilation starts only at O(alphas**2). As a result, the dependence of the theoretical predictions on the renormalization scale is very large. The only reliable way to reduce this dependence and, therefore, get more precise predictions is to include the full next-to-leading order correction. (Source:

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  1. Signer, Adrian: MENLO_PARC, a program for $e^+e^-\to 4$ jets at next-to-leading order (1997)