MENLO - PARC , a program for e + e - - + 4 jets at next - to - leading order

MENLO-PARC is a general purpose Monte Carlo program for calculating the next-toleading order O(a:) 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 2 intermediate states (and y 2 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 l/m&, or higher powers of the top quark mass. Submitted to Computer Physics Communications ‘Research supported by the Swiss -National Science Foundation and by the Department of Energy under grant DE-AC03-76SF00515