Coherence and Incoherence in QCD Jets Dynamics (QCD Jets and Branching Processes)

The interpretation of QCD jets as Markov branching processes obtained by solving Konishi–Ukawa–Veneziano equations [1] in the leading logarithmic approximation with a fixed cut-off regularization prescription [2] is reviewed, and its impact in multiparticle dynamics critically examined. Independent intermediate gluon sources (clans) are generated through quark–bremsstrahlung, each source then decays into final partons according to a cascading mechanism dominated by gluon self-interaction. At the hadron level, approximate universal regularities are expected in the different components (or substructures) of the various classes of high-energy collisions. The general behavior of collective variables of final multiplicity distributions is reproduced in terms of the weighted superposition of the above-mentioned regularities controlling the component behaviors of each collision. Predictions of signals of new physics at LHC [3] are reviewed, and perspective of the 1/N expansion approach [4] indicated.