Enhanced charm hadroproduction due to nonlinear corrections to the DGLAP   equations
  We have studied the effects of nonlinear scale evolution of the parton distribution functions to charm production in $pp$ collisions at center-of-mass energies of 5.5, 8.8 and 14 TeV. We find that the differential charm cross section can be enhanced up to a factor of 4-5 at low $p_T$. The enhancement is quite sensitive to the charm quark mass and the renormalization/factorization scales. 
K.J. Eskola, V.J. Kolhinen, R. Vogt