A MODEL FOR THE PARTON DISTRIBUTIONS IN HADRONS

A simple model is presented for the parton distributions in hadrons. T he parton momenta in the hadron rest frame are derived from a spherica lly symmetric, Gaussian, distribution having a width motivated by the Heisenberg uncertainty relation applied to the hadron size. Valence qu arks and gluons originate from the 'bare' hadron, while sea partons ar ise mainly from pions in hadronic fluctuations. Starting from a low Q( 2) scale, the distributions are evolved with next-to-leading order DGL AP and give the proton structure function F-2(x,Q(2)) in good agreemen t with deep inelastic scattering data. (C) 1998 Elsevier Science B.V. All rights reserved.