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Indications for the production of a neutral excited hyperon in the reactionpp -> p K^+ Y^{0*} are observed in an experiment performed with the ANKEspectrometer at COSY-J\"ulich at a beam momentum of 3.65 GeV/c. Two finalstates were investigated simultaneously, viz. Y^{0*} -> pi^+X^- and pi^-X^+,and consistent results were obtained in spite of the quite differentexperimental conditions. The parameters of the hyperon state are M(Y^{0*})=(1480 +/- 15) MeV/c^2 and Gamma(Y^{0*})= (60 +/- 15) MeV/c^2. The productioncross section is of the order of few hundred nanobarns. Since the isospin ofthe Y^{0*} has not been determined here, it could either be an observation ofthe Sigma(1480), a one-star resonance of the PDG tables, or alternatively aLambda hyperon. Relativistic quark models for the baryon spectrum do notpredict any excited hyperon in this mass range and so the Y^{0*} may be ofexotic nature.Comment: 4 pages, 3 figures, accepted for publication in Phys.Rev.Let

physical review letters

Evidence for an Excited Hyperon State in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>Y</mml:mi><mml:mrow><mml:mn>0</mml:mn><mml:mo>*</mml:mo></mml:mrow></mml:msup></mml:math>

Evidence for an Excited Hyperon State inpp→pK+Y0*