42 research outputs found
Quartic anomalous couplings at LEP
The search for quartic anomalous gauge couplings at LEP requires appropriate
predictions for the radiative processes e+ e- \to \nu\bar\nu \gamma\gamma, e+
e- \to q\bar{q}\gamma\gamma and e+ e- \to 4 fermions+\gamma. Matrix elements
are exactly computed at the tree level, and the effects of anomalous couplings
and initial-state radiation are included. Comparisons with results and
approximations existing in the literature are shown and commented. Improved
versions of the event generators NUNUGPV and WRAP are made available for
experimental analysis.Comment: LaTeX, 12 pages, 5 figures. Minor changes, version to appear in Phys.
Lett.