MENLO_PARC, a program for e+e− → 4 jets at next-to-leading order Original Research Article

MENLO_PARC is a general purpose Monte Carlo program for calculating the next-to-leading order O(αs3) corrections to four-jet quantities in electron-positron annihilation. Any quantity which can be constructed out of the four jet momenta and which is insensitive to the quark helicities and the beam orientation can be computed. Both virtual photon and Z intermediate states (and γ-Z interference) are included, hence the quantities can be computed for arbitrary center of mass energies. The cancellation of real and virtual singularities has been achieved using a general version of the subtraction method. The only approximation which has been made is the neglect of the light quark masses and terms which are suppressed by 1/mtop4 or higher powers of the top quark mass.