Effects of a dynamical role for exchanged quarks and nuclear gluons in nuclei: multinucleon correlations in deep-inelastic lepton scattering

Abstract

It is shown that new data from the HERMES collaboration, as well as all of the earlier improved data from experiments concerning the EMC effect and shadowing in deep-inelastic scattering of leptons from nuclei, provide strong evidence for an explicit dynamical role played by exchanged quarks and nuclear gluons in the basic, tightly-bound systems of three and four nucleons, also occurs [4,5] in the domain of small x < ∼ 0.06, at low and moderate Q 2 , the negative of the squared four-momentum transfer from the lepton. This effect is usually referred to as "shadowing". An effect of this kind is expected at small x, at and near to Q 2 = 0, as a geometrical effect of the nuclear surface, which diminishes the intensity of vector-meson-like components of the photon through strong interactions with nucleons near to this surface [7]. From the very beginning [2,3] of the experimental measurements, there have been two 1

Testing deconfinement at high isospin density

“…This is a non trivial difference between free-nucleon and nuclear structure functions, for a review see [38]. In particular models invoking the formation of multi-quark clusters have been rather popular [39,40,41]. Our analysis suggests a dependence of the EMC effect on the isospin, since the probability of forming virtual multi-quark bags would be enhanced in neutron rich nuclei.…”