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Evidence for the two pole structure of the Lambda(1405) resonance

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Evidence for the two pole structure of the Lambda(1405) resonance

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dc.contributor.author Magas, Volodymyr
dc.contributor.author Oset Báguena, Eulogio
dc.contributor.author Ramos Gómez, Àngels
dc.date.accessioned 2015-09-08T09:12:19Z
dc.date.available 2015-09-08T09:12:19Z
dc.date.issued 2005
dc.identifier.citation Magas, Volodymyr Oset Báguena, Eulogio Ramos Gómez, Àngels 2005 Evidence for the two pole structure of the Lambda(1405) resonance Physical Review Letters 95 5 052301-1 052301-4
dc.identifier.uri http://hdl.handle.net/10550/46946
dc.description.abstract 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 \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, provides a firm evidence of the two pole structure of the Lambda(1405).
dc.language.iso eng
dc.relation.ispartof Physical Review Letters, 2005, vol. 95, num. 5, p. 052301-1-052301-4
dc.subject Física
dc.title Evidence for the two pole structure of the Lambda(1405) resonance
dc.type journal article es_ES
dc.date.updated 2015-09-08T09:12:19Z
dc.identifier.doi 10.1103/PhysRevLett.95.052301
dc.identifier.idgrec 025696
dc.rights.accessRights open access es_ES

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