Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9857573 | Nuclear Physics B - Proceedings Supplements | 2005 | 5 Pages |
Abstract
Three baryon resonances with masses of 1532.2±1.3, 1577.7±1.9, and 1658.6±4.4MeV are observed in invariant mass of the KS0p system formed in neutrino and antineutrino collisions with deuterons and neon nuclei. Observed widths of the 1532-MeV and 1578-MeV resonances are consistent with being entirely due to apparatus smearing, and their intrinsic widths are restricted to Î<12 and 23 MeV, respectively. For the 1659-MeV resonance, the data suggest a nonvanishing intrinsic width of Îâ¼20MeV. Significance levels of the three signals are near 7.1Ï, 5.0Ï, and 4.5Ï, respectively. The Σ+ hypothesis for either of these three resonances is disfavored by the data on associated Î hyperons and on formation of the ÎÏ system. These resonant states are tentatively interpreted as the recently discovered pentaquark baryon Î+(1530) and its spin/isospin partners. The analysis is based on neutrino data collected by past bubble-chamber experiments.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
A.E. Asratyan, A.G. Dolgolenko, M.A. Kubantsev,