2010 J.A. Caballero et al, "Scaling Function and Nucleon Momentum Distribution" arXiv

We revisit the basic expressions involved in scaling studies and how they can be linked to the nucleon momentum distribution. In particular, the analysis applied in the past to the so-called scaling region, i.e., negative values of the scaling variable y, is extended here to positive y, since a "universal" superscaling function has been extracted from the analysis of the separated longitudinal data.