Unweighted event generation in hadronic WZ production at order (alpha(S)) - art. no. 053011

We present an algorithm for unweighted event generation in the partonic pro cess pp --> W(+/-)Z(j) with leptonic decays at next-to-leading order in alp ha (s). Monte Carlo programs for processes such as this frequently generate events with negative weights in certain regions of phase space. For simula tions of experimental data one would like to have unweighted events only. W e demonstrate how the phase space from the matrix elements can be combined to achieve unweighted event generation using a second stage Monte Carlo int egration over a volume of real emissions (jets). Observable quantities are kept fixed in the laboratory frame throughout the integration. The algorith m is applicable to a broader class of processes and is CPU intensive.