Abstract

We present a new algorithm for the probalistic evolution of jet cascades, based on the leading log approximation to perturbative QCD, augmented by coherence studies. Compared to previous models, emphasis is put on expressing kinematical variables in terms of Lorentz invariants and on matching on to the three-jet matrix element in e +e − annihilation. A systematic study is made of various assumptions in the model, such as the implementation of kinematics, the choice of Q 2 scale and the inclusion of angular ordering. In particular, we address the issue of how to find experimental evidence for coherence effects.

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