The point of view I take to summarize some of the research activities in Italy in the field of hadronic physics, is determined by the (today accepted) fundamental degrees of freedom of the strong interactions, namely quarks and gluons. The Sec. 2 is devoted to the link of the fundamental theory of strong interactions, Quantum Chromodynamics (QCD), with… (More)

Figure 6. The proton polarized structure function g1 at Q2 = 3 GeV2. The full curve represents the NLO (MS) results of a complete light-front calculation within a scenario where no gluons are present at the hadronic scale (scenario A); the corresponding nonrelativistic calculation are shown by the dot-dashed line. A scenario including negative polarized gluons ( ∫ ∆G = −0.7) at the hadronic scale is summarized by the dotted line; dashed line shows the case of positive gluon polarization ( ∫ ∆G = +0.7).