Heavy Quark Photoproduction in k_T Factorization Approach
  We investigate the heavy quark photoproduction based on the k_T factorization approach, focusing on the results from the saturation model. The deviations in the results using the unintegrated gluon distribution considering the saturation model and the derivative of the collinear gluon distribution are analysed. Total cross sections and p_T distributions are analysed in detail, setting the deviations between the color dipole approximation and the complete semihard approach. 
C. Brenner Mariotto, M.B. Gay Ducati, M.V.T. Machado (Rio Grande do   Sul U.)