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Description:
Using an effective Lagrangian approach as well as the Quark-Gluon Strings Model, we analyze near-threshold production of a(0)(980)-mesons in the reaction NN --> dK (K) over bar as well as the background of non-resonant K (K) over bar -pair production. We argue that the reaction pp --> dK+(K) over bar (0) at an energy release Q less than or equal to 100 MeV is dominated by the intermediate production of the a(0)(980)-resonance. At larger energies the non-resonant K+(K) over bar (0)-pair production-where the kaons are produced in a relative P-wave-becomes important. The effects of final-state interactions are evaluated in a unitarized scattering length approach and found to be in the order of a 20% suppression close to threshold. Thus, in present experiments at the Cooler Synchrotron COSY-Julich for Q less than or equal to 107 MeV the a(0)(+) signal can reliably be separated from the non-resonant K+(K) over bar (0) background.