Abstract
The nature of the Λ ( 1405 ) is discussed based on the unitarised coupled-channels approach with chiral dynamics (chiral unitary model). This approach describes the K ¯ N scattering cross sections and the Λ ( 1405 ) spectra phenomenologically very well. With this successful description of Λ ( 1405 ) , it is found that the Λ ( 1405 ) is composed by two resonance states having different coupling nature to the meson-baryon states. As a consequence, the resonance position in the πΣ invariant mass spectrum depends on the initial channel of the Λ ( 1405 ) production. To observe the Λ ( 1405 ) initiated by the K ¯ N channel, K − d → Λ ( 1405 ) n is one of the most favorable reactions. Hadronic molecule states with kaons are also discussed by emphasizing an important role of Λ ( 1405 ) as a quasibound state of K ¯ N
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