Hadronic Structure from Perturbative dressing in QCD - The Valon Model
  In the Framework of {\it{valon model}} we have calculated the parton distribution in a valon for both the polarized and unpolarized cases. These distributions are originated purely from the dressing of a valence quark in QCD and are common to all hadrons. Structure functions, $F_{2}^{p,\pi}$, are obtained, which agree rather well with the experimental results. A simple relation between $F_{2}^{p}$ and $F_{2}^{\pi}$ is inferred. For the polarized structure function, $g_{1}$ while the model gives good agreement with data, it requires a sizable angular momentum contribution to the spin of the valon, and hence to that of proton. This contribution is calculated. 
Firooz Arash, and Fatemeh Taghavi