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Evidence for the two pole structure of the Lambda(1405) resonance
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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)
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MAGAS, Volodymyr, OSET BAGUENA, Eulogio and RAMOS GÓMEZ, Àngels. Evidence for the two pole structure of the Lambda(1405) resonance. Physical Review Letters. 2005. Vol. 95, num. 5, pags. 052301-1-052301-4. ISSN 0031-9007. [consulted: 4 of July of 2026]. Available at: https://hdl.handle.net/2445/12838