The hard bremsstrahlung in e+e-to4f with non-zero fermion masses

Abstract

An efficient method for calculating polarized matrix elements of the four fermion reactions e+e“ —t 4 / and corresponding hard bremsstrahlung reactions with non-zero fermion masses is discussed. The numerical results for the total cross sections and some differential cross sections of e+e“ —t u d ^P n and e+e“ —t udg^vllA are given. The dependence on the fermion masses is illustrated by comparing the hard bremsstrahlung corrections to different semi-leptonic channels.