Abstract
A modified quark-parton model is considered. We assume a nucleon is composed of valence quarks and gluons. Quark pairs are produced via gluon-photon (or gluon-intermediate vector boson) interactions, which replace the sea contribution of a conventional quark-parton model. The theory has logarithmic ${q}^{2}$ violation of scaling for the structure functions. The model predictions are compared with recent experimental data from Fermilab. Charmed-hadron-production effects on the structure functions are considered in the standard model with the SU(4) \ifmmode\times\else\texttimes\fi{} SU${(3)}_{\mathrm{color}}$ symmetry group. The contribution is \ensuremath{\sim} 10% at $x\ensuremath{\le}0.1$, several percent at $0.1\ensuremath{\le}x\ensuremath{\le}0.25$, and less than 1% at $x\ensuremath{\le}0.25$ for $10\ensuremath{\le}{Q}^{2}\ensuremath{\le}50$ Ge${\mathrm{V}}^{2}$.
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