Evidence for a narrow resonance at 1530 MeV/c2 in the K0p-system of the reaction pp→Σ+K0p from the COSY-TOF experiment
Abstract
The hadronic reaction pp→Σ+K0p 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 K0p-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) μb. Since a resonance in this subsystem must have strangeness S=+1 we claim it to be the Θ+ state for which very recently evidence was found in various experiments.
- Publication:
-
Physics Letters B
- Pub Date:
- August 2004
- DOI:
- 10.1016/j.physletb.2004.05.067
- arXiv:
- arXiv:hep-ex/0403011
- Bibcode:
- 2004PhLB..595..127A
- Keywords:
-
- Glueball and non-standard multi-quark/gluon states;
- Nucleon-nucleon interactions;
- Baryons;
- Other particles;
- High Energy Physics - Experiment
- E-Print:
- 11 pages, 7 figures