Eur. Phys. J. C 21, 291-301 (2001)
DOI: 10.1007/s100520100736

Radiative four-fermion processes at LEP2

G. Montagna¹, M. Moretti², O. Nicrosini¹, M. Osmo¹ and F. Piccinini<sup>1

1</sup>  Dipartimento di Fisica Nucleare e Teorica, Università di Pavia and INFN, Sezione di Pavia, via A. Bassi 6, 27100 Pavia, Italy
²  Dipartimento di Fisica, Università di Ferrara and INFN, Sezione di Ferrara, Ferrara, Italy

(Received: 14 March 2001 / Revised version: 26 June 2001 / Published online: 3 August 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )

Abstract
The production of four fermions plus a visible photon in electron-positron collisions is analyzed, with particular emphasis on the LEP2 energy range. The study is based on the calculation of exact matrix elements, including the effect of fermion masses. In the light of the present measurements performed at LEP, triple and quartic anomalous gauge couplings are taken into account. Due to the presence of a visible photon in the final state, particular attention is paid to the treatment of higher-order QED corrections. Explicit results for integrated cross sections and differential distributions are shown and commented on. The features of the Monte Carlo program WRAP, used to perform the calculation and available for experimental analysis, are described.

© Società Italiana di Fisica, Springer-Verlag 2001