THREE-BODY DECAY FUNCTIONS IN QCD JETS

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Abstract
Jet evolution based on perturbative QCD is studied taking into account the next-to-leading-order effect. The 3-body decay functions are required to be positive to generate the jet evolution in a Monte Carlo simulation and their magnitude is to be small enough to assure the perturbative expansion. We present a description of the angular ordering which enables us to obtain decay functions for gluon→3 gluons and quark→ quark+2 gluons which are positive and of sizable magnitude.

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