Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp -->Sigma+ K0 p from the COSY-TOF experiment

___________________________________________________________________________ Abstract The hadronic reaction p K p p 0 + S fi was measured exclusively at a beam momentum of 2.95 GeV/c using the TOF detector at the COSY storage ring. A narrow peak was observed in the invariant mass spectrum of the p K 0 subsystem at 1530 – 5 MeV/c 2 with a significance of 4 – 6 standard deviations, depending on background assumptions. The upper limit of 18 – 4 MeV/c 2 (FWHM) for its width is given by the experimental resolution. The corresponding total cross section is estimated to be about 0.4 – 0.1(stat) – 0.1(syst) m b. Since a resonance in this subsystem must have strangeness S = + 1 we claim it to be the + Q state for which very recently evidence was found in various experiments.