Evolution at small x

Details Evolution at small x Evolution at small x

2003-05-15

arxiv.org/abs/hep-ph/0305171v2

Acta Phys.Polon. B34 (2003) 2989-3000

Physics

High Energy Physics

High Energy Physics - Phenomenology

To appear in the special issue of Acta Physica Polonica to celebrate the 65th Birthday of Professor Jan Kwiecinski. 12 pages w

Scientific paper

At present there is no correct theory of evolution of F_2(x,Q^2) at small x. It is a mixture of hard and soft pomeron exchange and perturbative QCD very successfully describes the evolution of the hard-pomeron component. This allows the gluon density to be calculated. It is somewhat different from what is conventionally supposed, but it leads to a clean PQCD description of the data for the charm structure function. Perturbative QCD breaks down for the evolution of the soft-pomeron component of F_2(x,Q^2).

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