Comparison of $k_T$-Factorization Approach and QCD Parton Model for   Charm and Beauty Hadroproduction
  We compare the numerical predictions for heavy quark production in high energy hadron collisions of the conventional QCD parton model and the $k_T$-factorization approach (semihard theory). The total production cross sections, one-particle rapidity and $p_T$ distributions as well as two-particle correlations are considered. The difference in the predictions of the two approaches is not very large, while the shapes of the distributions are slightly different. 
M.G.Ryskin, Yu.M.Shabelski and A.G.Shuvaev