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JOURNALS // Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki // Archive

Pis'ma v Zh. Èksper. Teoret. Fiz., 2005 Volume 81, Issue 7, Pages 391–394 (Mi jetpl1709)

This article is cited in 2 papers

FIELDS, PARTICLES, AND NUCLEI

Soft and hard processes in QCD

I. M. Dremin

P. N. Lebedev Physical Institute, Russian Academy of Sciences

Abstract: QCD equations for the generating functions are applied to separate soft and hard jets in $e^+e^-$-processes of multiparticle production. The dependence of average multiplicities and higher moments of multiplicity distributions of particles created in a “newly born” soft subjets on the share of energy devoted to them is calculated in fixed coupling gluodynamics. This dependence is the same as for the total multiplicity up to a constant factor if soft jets are defined as those carrying out a fixed share of initial energy at all energies. The constant factor depends on this share in a non-trivial way. Other definitions are also proposed. The relation between these quantities for soft and hard processes is discussed.

PACS: 12.38.Bx

Received: 28.02.2005

Language: English


 English version:
Journal of Experimental and Theoretical Physics Letters, 2005, 81:7, 307–310

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