Double parton interactions in proton deuteron collisions

MPIs are the tool to obtain information on the correlations between partons in the hadron structure. In the case of pp collisions the effects of correlations in the transverse coordinates and in fractional momenta are in fact unavoidably mixed in the final observables. On the contrary, the contribution to the pA cross section, where the projectile interacts with large momentum exchange with at least two target nucleons simultaneously, has only a weak dependence on the correlations in the transverse coordinates. By studying the simplest case, double parton interactions in pD collisions, one can thus obtain non trivial information on the two-body parton correlations.