Nucleon Structure Functions from a Chiral Soliton

Abstract We study nucleon structure functions within the bosonized version of the Nambu-Jona-Lasinio (NJL) model in which the nucleon emerges as the soliton in the chiral field. Upon boosting to the infinite momentum frame and performing the q2-evolution in the context of the Gottfried sum rule for electron nucleon scattering we determine the intrinsic scale μ2 of the NJL chiral soliton. We also compute the leading twist contributions of the polarized structure functions g1 and g2. We compare these model predictions with experiment by evolving them from μ2 to the scale where the data are taken. Analogously we analyze the chiral-odd structure functions hT and hT. Finally we generalize the treatment to flavor SU(3).