The QCD picture of multiparticle production in hard interactions is reviewed. We illustrate the basic properties of high energy bremsstrah-lung with practical examples such as hadroproduction of J/ψ, photon radiation in W± decays, hadronic accompanyment in Higgs production. Special emphasis is given to coherence effects which determine the structure of particle multiplication in QCD jets (humpbacked plateau) and the pattern of inter-jet hadron flows (QCD string/drag effects).
KeywordsPerturbative QCD hard processes multiparticle production
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