The nature of the Λ(1405) resonance in chiral dynamics

By T. Hyodo, D. Jido. 2011

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Abstract The Λ ( 1405 ) baryon resonance plays an outstanding role in various aspects in hadron and nuclear physics. It has been considered that the Λ ( 1405 ) resonance is generated by the attractive interaction of the antikaon and the nucleon as a quasi-bound state below its threshold decaying into the π Σ channel. Thus, the structure of Λ ( 1405 ) is closely related to the K N interaction which is the fundamental ingredient to study few-body systems with antikaon. In this paper, after reviewing the basic properties of the Λ ( 1405 ) resonance, we introduce the dynamical coupled-channel model which respects chiral symmetry of QCD and the unitarity of the scattering amplitude. We show that the structure of the Λ ( 1405 ) resonance is dominated by the meson–baryon molecular component and is described as a superposition of two independent states. The meson–baryon nature of Λ ( 1405 ) leads to various hadronic molecular states in few-body systems with strangeness which are hadron composite systems driven by the hadronic interactions. We summarize the recent progress in the investigation of the Λ ( 1405 ) structure and future perspective of the physics of the Λ ( 1405 ) resonance.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/297175d44b19f2f8df86c146a34fa216aa7c8bdf

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In Nuclear and High Energy Physics

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Baryons as relativistic three-quark bound states (2016, background): “On the other hand, the Λ(1405) has long since been viewed as a prime candidate for a state that is generated dynamically via coupled channel effects, see [37] for a review.”