This title appears in the Scientific Report :
2006
Please use the identifier:
http://hdl.handle.net/2128/1639 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhyRevLett.96.012002 in citations.
Evidence for an Excited Hyperon State in pp->pK+Y0*
Evidence for an Excited Hyperon State in pp->pK+Y0*
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 consi...
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Personal Name(s): | Zychor, I. |
---|---|
Koptev, V. / Büscher, M. / Dzyuba, A. / Keshelashvili, I. / Kleber, V. / Koch, H. R. / Krewald, S. / Maeda, Y. / Mikirtichyants, S. / Nekipelov, M. / Ströher, H. / Wilkin, C. | |
Contributing Institute: |
Institut 2 (Experimentelle Kernphysik II); IKP-E-2 Jülich-Aachen Research Alliance - Simulation Sciences; JARA-SIM |
Published in: | Physical review letters, 96 (2006) S. 012002 |
Imprint: |
College Park, Md.
APS
2006
|
Physical Description: |
012002 |
DOI: |
10.1103/PhyRevLett.96.012002 |
Document Type: |
Journal Article |
Research Program: |
Physik der Hadronen und Kerne |
Series Title: |
Physical Review Letters
96 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhyRevLett.96.012002 in citations.
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. |