Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/12838
Title: Evidence for the two pole structure of the Lambda(1405) resonance
Author: Magas, V. K.
Oset Baguena, Eulogio
Ramos Gómez, Àngels
Keywords: Partícules (Física nuclear)
Teoria de camps (Física)
Particles (Nuclear physics)
Field theory (Physics)
Issue Date: 2005
Publisher: American Physical Society
Abstract: The K{sup -}p{yields}{pi}{sup 0}{pi}{sup 0}{sigma}{sup 0} reaction is studied within a chiral unitary model. The distribution of {pi}{sup 0}{sigma}{sup 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}{sup 0} prior to the K{sup -}p interaction leading to the {lambda}(1405). This ensures the coupling of the {lambda}(1405) to the K{sup -}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}{sup -}p{yields}K{sup 0}{pi}{sigma} 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, provide firm evidence of the two-pole structure of the {lambda}(1405)
Note: Reproducció digital del document proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevLett.95.052301
It is part of: Physical Review Letters, 2005, vol. 95, núm. 5, p. 052301-1-052301-4
Related resource: https://doi.org/10.1103/physrevlett.95.052301
http://dx.doi.org/10.1103/PhysRevLett.95.052301
URI: http://hdl.handle.net/2445/12838
ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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