Monte Carlo Generators

To mimic the actual events seen within the OPAL detector a number of Monte Carlo generators are employed throughout this analysis. These generators produce the final state four-vectors of all the particles within the event. Not only are there generators that produce four-fermions seen from the W-pair process, but there are also those which produce four-fermion final states through all the processes discussed in this and the last chapter. Generators are also used to simulate the other background events, such as ${\rm Z}^{0}/\gamma \rightarrow {\rm q}\bar{\rm q}$. Many of these generators do not only produce the final particles calculated from the leading order Feynman diagrams, but they also include such effects as Initial State Radiation (ISR), Final State Radiation (FSR) and Coulomb corrections. In this section the different types of Monte Carlo generators used are discussed.