Zychor, I; Koptev, V; Buscher, M; Dzyuba, A; Keshelashvili, I; Kleber, V; Koch, HR; ... Wilkin, C; + view all Zychor, I; Koptev, V; Buscher, M; Dzyuba, A; Keshelashvili, I; Kleber, V; Koch, HR; Krewald, S; Maeda, Y; Mikirtichyants, S; Nekipelov, M; Stroher, H; Wilkin, C; - view fewer (2006) Evidence for an excited hyperon state in pp -> pK(+)Y(0*). PHYS REV LETT , 96 (1) , Article 012002. 10.1103/PhysRevLett.96.012002.

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Abstract

Indications for the production of a neutral excited hyperon in the reaction pp -> pK(+)Y(0*) are observed in an experiment performed with the ANKE spectrometer at COSY-Julich at p(beam)=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 for Y-0* decaying through these channels 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 Particle Data Group 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.

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