Quantitative analysis of the quark-parton distributions

A quantitative and less model-dependent analysis of the quark parton distributions is attempted. Both the valence-sea (symmetric core) model and the deformed core model are compared in detail with the present data. We find that the deformed core model is more reasonable if we assume the almost monotonous behaviour of the ratio of two valence quarks. Some properties of the distributions in the wee region, such as the rate of convergence of Adler's neutrino sum rule, Regge behaviour and J = 0 fixed pole residues, are investigated.