Evidence for the two pole structure of the Lambda(1405) resonance
| dc.creator | Magas, V. K. | |
| dc.creator | Oset, E. | |
| dc.creator | Ramos, A. | |
| dc.date | 2005-03-04 | |
| dc.date.accessioned | 2026-07-07T10:29:26Z | |
| dc.date.available | 2026-07-07T10:29:26Z | |
| dc.description | The K^- p --> pi^0 pi^0 Sigma^0 reaction is studied within a chiral unitary model. The distribution of pi^0 Sigma^0 states forming the Lambda(1405) shows, in agreement with a recent experiment, a peak at 1420 MeV and a relatively narrow width of Gamma = 38 MeV. The mechanism for the reaction is largely dominated by the emission of a pi^0 prior to the K^- p interaction leading to the Lambda(1405). This ensures the coupling of the Lambda(1405) to the K^- p channel, thus maximizing the contribution of the second state found in chiral unitary theories, which is narrow and of higher energy than the nominal Lambda(1405). This is unlike the pi^- p --> K^0 πSigma reaction, which gives more weight to the pole at lower energy and with a larger width. The data of these two experiments, together with the present theoretical analysis, provides a firm evidence of the two pole structure of the Lambda(1405). | |
| dc.description | 4 pages, 6 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0503043 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0503043 | |
| dc.identifier | Phys.Rev.Lett.95:052301,2005 | |
| dc.identifier | doi:10.1103/PhysRevLett.95.052301 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177803 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Evidence for the two pole structure of the Lambda(1405) resonance | |
| dc.type | text |