Near-threshold production of a0(980)-mesons in the reaction
Institute for Nuclear Research, 60th October Anniversary Prospect 7A, 117312, Moscow, Russia
2 Institute of Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117259, Moscow, Russia
3 Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany
4 Institut für Theoretische Physik, Universität Giessen, Heinrich-Buff-Ring 16, D-35392, Giessen, Germany
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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 as well as the background of non-resonant -pair production. We argue that the reaction at an energy release MeV is dominated by the intermediate production of the a 0(980)-resonance. At larger energies the non-resonant -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-Jülich for MeV the a 0 + signal can reliably be separated from the non-resonant background.
© Società Italiana di Fisica and Springer-Verlag, 2004