Nucleon Structure Functions from a Chiral Soliton in the Infinite Momentum Frame

The leading twist contributions to the nucleon structure functions are dominated by light like correlations. For models which describe the nucleon as a (static) localized object these correlations are accessible upon transformation to the infinite momentum frame (IMF). As a consequence of the Lorentz contraction associated with boosting the quark fields to the IMF the structure functions computed from this configuration are different from zero only when the Bjorken scaling variable is less than unity. This is a consequence of the Lorentz contraction associated with this boost resulting in proper support for model structure functions. As an example we show that for structure functions calculated in the valence quark approximation to the Nambu–Jona–Lasinio chiral soliton model the Lorentz contraction also has significant effects for moderate values of the Bjorken variable. ∗ Supported in part by the Deutsche Forschungsgemeinschaft (DFG) under contract Re 856/2-3, the Graduiertenkolleg Hadronen und Kerne at Tübingen University, and by the U.S. Department of Energy (D.O.E.) under contract DE–FE–02–95ER40923. 1