In spite of the recent progress in both theoretical and experimental studies many aspects of proton-proton (pp) and proton-nucleus (pA) collisions still require a detail investigation. At high collision energies, the probability of simultaneous scatterings of different pairs of partons, contributing to the same inelastic event, has to be considered. In particular, double parton scattering (DPS) processes can play a dominant role for some specific kinematic regions of multi-jet production. The DPS measurements of pA collisions provide important complementary information to that gathered from pp collisions on the nature of multiple interactions.
In this poster I will present latest theoretical results on four-jet and three-jet plus gamma production via DPS in pp and pA collisions, as well as its dependence on different kinematical cuts and different phenomenological assumptions.