Featuring the structure functions geometry
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We consider geometrical properties of the polarized and unpolarized structure functions and provide definition for the $b$--dependent structure functions. It is shown that unitarity does not allow factorized form of the structure functions over the $x$ and $b$ variables. We conclude that the spin of constituent quark has a significant orbital angular momentum component.
8 pages, 1 figure
8 pages, 1 figure