New phenomena in the Q-region

The Q-mass region has been studied by two high statistics experiments which have allowed a partial wave analysis (PWA) to be performed in small (Kππ)-mass intervals. The experiments were carried out by the SLAC spectrometer group who investigated the diffractive reactions of K-p → K-π+π-p, K+p → K+ π+ π-p and also in a bubble chamber with combination of data from the reactions of K-p → K-π+ π- p, K-p → anti K0 π-π0p. The PWA results for various reactions considered agree essentially. There exists good evidence for at least one strangeness-1 resonance which decays mainly into Krho and which is produced by a different mechanism than all the other states. Its mass has been in approximately 1300 MeVrange. To search for other decay modes of this resonance the low mass Kω-system was investigated. It shows a peak near threshold which is produced diffractively in the same way as the K rho-spectrum. Another interesting result concerning the (Kππ) system is given. The existence of a new strangeness-1 resonance is reported. The resonance parameters are: M approximately 1400 MeV, W approximately 250MeV