A model for parton distributions in hadrons

✍ Scribed by A. Edin; G. Ingelman

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 185 KB
• Volume: 79
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(99)00671-4

✦ Synopsis

The non-perturbative parton distributions in hadrons are derived from simple physical arguments resulting in an analytical expression for the valence parton distributions. The sea partons arise mainly from pions in hadronic fluctuations. The model gives new insights and a good description of structure function data.

Hard processes involving hadrons are calculated by folding perturbative QCD matrix elements with parton distributions describing the probability of finding a quark or a gluon in the hadron.

Perturbative QCD evolution describes the dependence of the parton distributions on the hard scale Q of the interaction. However, their dependence on the momentum fraction x at the lower limit for applying perturbative QCD, Qo ~ 0.5-2 GeV, are fitted to data using parameterisations, e.g. of the form [1][2][3]