Evidence for two Lambda(1405) resonance states
Oset, E. · Magas, V. K. · Ramos, A.
Original · EN
The K- p → π⁰ π⁰ Σ⁰ reaction is studied within a chiral unitary model. The distribution of π⁰ Σ⁰ states forming the Λ(1405) shows, in agreement with a recent experiment, a peak at 1420 MeV and a relatively narrow width of Γ= 38 MeV. We use these data in combination with those of the π- p → K⁰ πΣ reaction and elements of chiral unitary theory to prove that there are two Λ(1405) states instead of one as so far assumed.
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