Dynamics of 1S0 diproton formation in the pd→{pp}sn and pN→{pp}sπ reactions in the GeV region

Mechanisms for the production of 1S0 diproton pairs, {pp}s, in the pd→{pp}sn reaction are studied at proton beam energies 0.5-2 GeV in kinematics similar to those of backward elastic pd scattering. This reaction provides valuable information on the short-range NN and pd interactions that is complementary to that investigated in the well-known pd→dp and dp→p(0degree)X processes. The pd→{pp}sn reaction is related to the subprocesses π0d→pn and pN→{pp}sπ using two different one-pion-exchange (OPE) diagrams. Within both these models a reasonable agreement could be obtained with the data below 1 GeV. The similar energy dependence of the pd→{pp}sn and pd→dp cross sections and the small ratio of about 1.5% in the production of {pp}s to deuteron final states follow naturally within the OPE models