ANTIPROTON-PROTON ANNIHILATION IN-FLIGHT

This is an overview of the preliminary results of ($) over bar pp anni hilation at incident ($) over bar p momenta of 600, 1200 and 1940 MeV/ c(). The data was taken at LEAR with the Crystal Barrel Detector (E. AKER et al: Nucl. Instrum, Methods A, 321, 108 (1992)). In the two pse udoscalar final states seven different channels are observable and the ir angular distributions are measured. They are compared to older data , if existent, and are found to be equal within the experimental error s. In the three-meson final states, an overview of the already examine d final states is given. Striking signals in the Dalitz plots and inva riant-mass projections for a set of final states are observed. In the final states eta eta pi(0) and eta eta eta a signal eta eta with the i nvariant mass of 1480 MeV/c(2) and a width of about Gamma approximate to approximate to 70 MeV/c(2) is visible. In the final-state omega eta pi(0) a signal in the omega eta invariant-mass spectrum at 1680 MeV/c (2) with a width Gamma approximate to 150 MeV/c(2) is observed. Finall y, in the final-state omega omega pi(0) two visible structures in the Dalitz plot are detected at 1600 MeV/c(2)(Gamma approximate to 90 MeV/ c(2)) and 1900 MeV/c(2) (Gamma approximate to 150 MeV/c(2)).