Threshold meson production will be studied within the framework of the COSY-11 installation, which is scheduled to be installed in autumn '94. The internal experiment uses (a regular COSY dipole, following a cluster target, to separate reaction products from the beam and to analyze their momenta, thus allowing the observation of reaction products at small angles. The structure of resonances, especially in the 1 GeV/c² mass range, is to be derived from missing mass reconstructions with both outgoing protons in the predominantly studied pp->ppX reaction. The identification of mesons or mesonic systems X is supported by the detection of charged decay products. Due to vanishing relative momenta of the ejectiles in threshold production, final state interactions should be observable.
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