Hadronic few-body systems in chiral dynamics, -- Few-body systems in hadron physics --

Abstract

Hadronic composite states are introduced as few-body systems in hadron physics. The $\Lambda (1405)$ resonance is a good example of the hadronic few-body systems. It has turned out that $\Lambda (1405)$ can be described by hadronic dynamics in a modern technology which incorporates coupled channel unitarity framework and chiral dynamics. The idea of the hadronic $\bar{K}N$ composite state of $\Lambda (1405)$ is extended to kaonic few-body states. It is concluded that, due to the fact that $K$ and $N$ have similar interaction nature in s-wave $\bar{K}$ couplings, there are few-body quasibound states with kaons systematically just below the break-up thresholds, like $\bar{K}NN$, $\bar{K}KN$ and $\bar{K}KK$, as well as $\Lambda (1405)$ as a $\bar{K}N$ quasibound state and $f_0(980)$ and $a_0(980)$ as $\bar{K}K$.

8 pages, 2 figures, contribution to 20th International IUPAP Conference on Few-Body Problems in Physics (FB20), 20-25 August 2011, Fukuoka, Japan

References in corpus (14)

• Chiral SU(3) theory of antikaon-nucleon interactions with improved threshold constraints
• Effective Kbar N interaction based on chiral SU(3) dynamics
• Origin of resonances in the chiral unitary approach
• Multi-quark hadrons from Heavy Ion Collisions
• Realistic calculations of Kbar-N-N, Kbar-N-N-N, and Kbar-Kbar-N-N quasibound states
• Three body resonances in two meson-one baryon systems
• Kaonic production of Lambda(1405) off deuteron target in chiral dynamics
• K anti-K N molecule state with I=1/2 and J^P=1/2^+ studied with three-body calculation
• Solution to Faddeev equations with two-body experimental amplitudes as input and application to J^P=1/2^+, S=0 baryon resonances
• anti-K anti-K N molecule state in three-body calculation
• Transition form factors of the N*(1535) as a dynamically generated resonance
• Dynamical generation of pseudoscalar resonances
• Valence quark and meson cloud contributions for the gamma* Lambda -> Lambda* and gamma* Sigma0 -> Lambda* reactions
• Kaon induced Lambda(1405) production on a deuteron target at DAFNE