Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-07-05
Eur.Phys.J.C12:77-86,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 6 figures
Scientific paper
10.1007/s100529900202
An improved efficient method of calculating the hard bremsstrahlung correction to e^+ e^- -> 4f for non-zero fermion masses is presented. The non-vanishing fermion masses allow us to perform the phase space integrations to the very collinear limit. We therefore can calculate cross sections independent of angular cuts. Such calculations are important for background studies. Results are presented for the total and some differential cross sections for e^+ e^- -> u d-bar mu^- nu and the corresponding hard bremsstrahlung process. The latter is of particular interest for a detailed investigation of the effects of final state radiation. In principle, the process e^+ e^- -> u d-bar mu^- nu gamma is also interesting since it helps to set bounds on possible anomalous triple and quartic gauge boson couplings involving photons. The size of mass effects is illustrated by comparing the final states u d-bar mu^- nu (gamma), c s-bar mu^- nu (gamma) and u d-bar tau^- nu(gamma).
Jegerlehner Fred
Kolodziej Karol
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