# EXCALIBUR — a Monte Carlo program to evaluate all four-fermion processes at LEP 200 and beyond

## Description

Abstract A Monte Carlo program is presented that computes all four-fermion processes in e ^+ e ^- annihilation. QED initial state corrections and QCD contributions are included. Fermions are taken to be massless, allowing a very fast evaluation of the matrix element. A systematic, modular and self-optimizing strategy has been adopted for the Monte Carlo integration, which serves also as a... Title of program: EXCALIBUR Catalogue Id: ADAJ_v1_0 Nature of problem Heavy vector boson production will be investigated at e+e- colliders in a wide range of energies. At LEP II, the relevant process is <PRE> e+e- -> W+W- (1) At higher energies other processes like e+e- -> Z Z, (2) e+e- -> W e nu_e, (3) e+e- -> Z e+e-, (4) e+e- -> Z nu_e bar(nu)_e, (5)</PRE> become important. The detected experimental signal for all above processes is a four fermion final state. Therefore, a Monte Carlo program being able to take into account both signal and background electroweak ... Versions of this program held in the CPC repository in Mendeley Data ADAJ_v1_0; EXCALIBUR; 10.1016/0010-4655(94)00138-R This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)