Observation of an Exotic S=+1 Baryon in Exclusive Photoproduction from the Deuteron
Abstract
In an exclusive measurement of the reaction γd→K+K-pn, a narrow peak that can be attributed to an exotic baryon with strangeness S=+1 is seen in the K+n invariant mass spectrum. The peak is at 1.542±0.005 GeV/c2 with a measured width of 0.021 GeV/c2 FWHM, which is largely determined by experimental mass resolution. The statistical significance of the peak is (5.2±0.6)σ. The mass and width of the observed peak are consistent with recent reports of a narrow S=+1 baryon by other experimental groups.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2003
- DOI:
- 10.1103/PhysRevLett.91.252001
- arXiv:
- arXiv:hep-ex/0307018
- Bibcode:
- 2003PhRvL..91y2001S
- Keywords:
-
- 13.60.Rj;
- 14.20.Jn;
- 14.80.-j;
- Baryon production;
- Hyperons;
- Other particles;
- High Energy Physics - Experiment;
- High Energy Physics - Phenomenology;
- Nuclear Experiment
- E-Print:
- 5 pages, 5 figures