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Excited neutral hyperons Y0* produced in the pp -> p K+ Y0* reaction with aCOSY beam momentum of 3.65 MeV/c have masses below 1540 MeV/c2. The ANKEspectrometer allows the simultaneous observation of different decay modes: Y0*-> pion0Sigma0, pion+-Sigma-+, pion0Lambda, K-p by measuring kaons and pions ofeither charge in coincidence with protons. We have found indications for aneutral excited hyperon resonance Y0* with a mass of (1480 +- 15) MeV/c2 and awidth of (60 +- 15) MeV/c2. The cross section for Y0* is of the order of fewhundred nanobarns. It can be either a Sigma0 or a Lambda hyperon and on thebasis of existing data no conclusion could be made whether it is a three-quarkbaryon or an exotic state. Missing- and invariant-mass techniques have beenused to identify the Lambda(1405) resonance decaying via Sigma0pion0. The crosssection for Lambda(1405) production is equal to (4.5 +- 0.9(stat) +- 1.8(syst))microbarn. The shape and position of the Lambda(1405) distribution are similarto those found from other decay modes, so no support is given to the two-polemodel.

Excited Hyperons Produced in Proton-Proton Collisions with Anke@COSY