The nature of Lambda(1405) hyperon resonance in chiral dynamics

Details The nature of Lambda(1405) hyperon resonance in chiral dynamics The nature of Lambda(1405) hyperon resonance in chiral dynamics

2010-03-24

arxiv.org/abs/1003.4560v1

Nuclear Physics, Section A 835 (2010), pp. 59-66

Physics

Nuclear Physics

Nuclear Theory

8 pages, three figures. Talk given at 10th International Conference on Hypernuclear and Strange Particle Physics (HYP-X), Toka

Scientific paper

10.1016/j.nuclphysa.2010.01.175

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

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