Non-perturbative interactions among partons

Summary

We propose a model of interactions among «wee» quarks and antiquarks. Our fundamental assumption is that such partons may give rise —through nonperturbative interactions— to pseudoscalar$q - \bar q$ bosons and to scalar diquarks; in particular we suppose that sea is organized in pseudoscalar$q - \bar q$ bosons. Some of the interactions that a valence quark has, either with another valence quark or with sea, modify the predictions of the naive quark-parton model about the spin and spin-averaged quark densities. In order to take into account these modifications we have suitably parametrized the probability densities relative to the interactions in question; moreover we have fixed all the parameters involved, in such a way that our model matches some data of nucleon structure functions and of low-energy hadron physics. Our model has some predictive power with respect to other data of deep inelastic scattering, in particular with respect to the recent EMC and NMC data; furthermore some predictions do not depend on the specific parametrizations chosen for the probability densities, but only on the kinds of interactions assumed. The predictions are in good agreement with available data.