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We present a complete lowest order calculation of the processe+e-?(e*)?e+e- ? based on a phenomenological Lagrangian where interference with “standard” amplitudes and spin correlation effects are considered. The calculation has been implemented in a Monte Carlo generator of unweighted events and can be used to study interactions with polarized beams as well as the effects of other excited fermions.

A calculation of the neutrino counting reaction is presented and implemented in a Monte Carlo generator of unweighted events. The non-photonic corrections are included following the star-scheme. The photonic corrections have been exponentiated following the “inductive” and the “structure functions” approach. For a realistic experimental set-up, the total corrections around theZ0 pole amount to ∼5% with respect to the one-loop result. The final precision achieved is better than 1%.