Evidence for an Excited Hyperon State in pp -> p K^+ Y^{0*}

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dc.creatorZychor, I.
dc.creatorKoptev, V.
dc.creatorBüscher, M.
dc.creatorDzyuba, A.
dc.creatorKeshelashvili, I.
dc.creatorKleber, V.
dc.creatorKoch, R.
dc.creatorKrewald, S.
dc.creatorMaeda, Y.
dc.creatorMikirtichyants, S.
dc.creatorNekipelov, M.
dc.creatorStröher, H.
dc.creatorWilkin, C.
dc.date2005-06-10
dc.date2005-11-17
dc.date.accessioned2026-07-07T11:59:55Z
dc.date.available2026-07-07T11:59:55Z
dc.descriptionIndications for the production of a neutral excited hyperon in the reaction pp -> p K^+ Y^{0*} are observed in an experiment performed with the ANKE spectrometer at COSY-Jülich at a beam momentum of 3.65 GeV/c. Two final states were investigated simultaneously, viz. Y^{0*} -> pi^+X^- and pi^-X^+, and consistent results were obtained in spite of the quite different experimental 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 production cross section is of the order of few hundred nanobarns. Since the isospin of the Y^{0*} has not been determined here, it could either be an observation of the Sigma(1480), a one-star resonance of the PDG tables, or alternatively a Lambda hyperon. Relativistic quark models for the baryon spectrum do not predict any excited hyperon in this mass range and so the Y^{0*} may be of exotic nature.
dc.description4 pages, 3 figures, accepted for publication in Phys.Rev.Lett
dc.identifierhttps://arxiv.org/abs/nucl-ex/0506014
dc.identifierhttp://arxiv.org/abs/nucl-ex/0506014
dc.identifierPhys.Rev.Lett.96:012002,2006
dc.identifierdoi:10.1103/PhysRevLett.96.012002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206734
dc.subjectNuclear Experiment
dc.titleEvidence for an Excited Hyperon State in pp -> p K^+ Y^{0*}
dc.typetext

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