Production of two $c \bar c$ pairs in double-parton scattering
  We discuss production of two pairs of $c \bar c$ within a simple formalism of double-parton scattering (DPS). Surprisingly very large cross sections, comparable to single-parton scattering (SPS) contribution, are predicted for LHC energies. Both total inclusive cross section as a function of energy and differential distributions for $\sqrt{s}$ are shown. We discuss a perspective how to identify the double scattering contribution. 
Marta Luszczak, Rafal Maciula and Antoni Szczurek
hep-ph nucl-th