Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-03-04
Phys.Usp. 45 (2002) 507-526; Usp.Fiz.Nauk 172 (2002) 551-571
Physics
High Energy Physics
High Energy Physics - Phenomenology
30 pages, LATEX, 12 Figs available at www.ufn.ru; the review pap er to be published in Physics-Uspekhi 45 (5) (2002)
Scientific paper
10.1070/PU2002v045n05ABEH001088
The theory of strong interactions, quantum chromodynamics (QCD), is quite successful in the prediction and description of main features of multiparticle production processes at high energies. The general perturbative QCD approach to these processes (mainly to e+e- -annihilation) is briefly formulated and its problems are discussed. It is shown that the analytical calculations at the parton level with the low-momentum cut-off reproduce experimental data on the hadronic final state in multiparticle production processes at high energies surprisingly accurately even though the perturbative expansion parameter is not very small. Moreover, it is important that the perturbative QCD has been able not only to describe the existing data but also to predict many bright qualitatively new phenomena.
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