Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-03-05
Phys.Lett.B595:127-134,2004
Physics
High Energy Physics
High Energy Physics - Experiment
11 pages, 7 figures
Scientific paper
10.1016/j.physletb.2004.05.067
The hadronic reaction pp --> Sigma+ K0 p was measured exclusively at a beam momentum of 2.95 GeV/c using the TOF detector at the COSY storage ring. A narrow peak was observed in the invariant mass spectrum of the K0 p subsystem at 1530 +- 5 MeV/c2 with a significance of 4 - 6 standard deviations, depending on background assumptions. The upper limit of 18 +- 4 MeV/c2 (FWHM) for its width is given by the experimental resolution. The corresponding total cross section is estimated to be about 0.4 +- 0.1(stat) +- 0.1(syst) microbarn. Since a resonance in this subsystem must have strangeness S = + 1 we claim it to be the Theta+ state for which very recently evidence was found in various experiments.
Abdel-Bary M.
Abdel-Samad S.
Brinkmann K.-Th.
Clement Heinz
Doroshkevich E.
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