Low lying S=-1 excited baryons and chiral symmetry

Abstract

The s-wave meson-baryon interaction in the $S=-1$ sector is studied by means of coupled-channels, using the lowest-order chiral Lagrangian and the N/D method to implement unitarity. The loops are regularized using dimensional renormalization. In addition to the previously studied $\Lambda (1405)$, employing this chiral approach leads to the dynamical generation of two more s-wave hyperon resonances, the $\Lambda (1670)$ and $\Sigma (1620)$ states. We make comparisons with experimental data and look for poles in the complex plane obtaining the couplings of the resonances to the different final states. This allows us to identify the $\Lambda (1405)$ and the $\Lambda (1670)$ resonances with $\bar{K}N$ and $K\Xi$ quasibound states, respectively.

12 pages, 2 figures, revised version to appear in Phys. Lett. B, errata corrected: modulus of coupling contants is modulus squared

Cited by in corpus (192)

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• The associated photoproduction of positive kaons and ${\pi }^0\Lambda$ or $\pi \Sigma$ pairs in the region of the $\Sigma$(1385) and $\Lambda$(1405) resonances
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• Study of a possible S=+1 dynamically generated baryonic resonance
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• Two, three, many body systems involving mesons
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• Dynamical Generation of Hyperon Resonances
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• Partial wave analysis of $\psi (3686)\to \Lambda {\bar{\Sigma }}^0{\pi }^0+c.c.$
• Quark-mass dependence of baryon resonances
• Strange meson-nucleon states in the quark potential model
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• The pseudoscalar meson and baryon octet interaction with strangeness $S=-2$ in the unitary coupled-channel approximation
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• Challenges in Hadron Physics
• A new N* resonance as a hadronic molecular state
• Photo- and Electron-Production of Mesons on Nucleons and Nuclei
• Further Theoretical Analysis on the $K^{-}{}^3\text{He}\to \Lambda pn$ Reaction for the $\bar{K}NN$ Bound-State Search in the J-PARC E15 Experiment
• Resonances in chiral unitary approaches
• The nature of the Lambda(1405)
• Search for the low-lying excited baryon ${\Sigma }^{\ast }(1/2^{-})$ through process ${\Lambda }_c^{+}\to \Lambda K^0{\pi }^{+}$
• Revealing dipion correlations for the observed substructure near the ${\pi }^{+}{\pi }^{-}$ mass threshold in $\psi (3686)\to J/\psi {\pi }^{+}{\pi }^{-}$
• Amplitude analysis and branching fraction measurement of $J/\psi \to \Lambda {\bar{\Sigma }}^0\eta +c.c$
• Polarization of $\Lambda (1405)$ in the $\gamma p\to K^{+}\pi \Sigma$ reaction
• Investigation of the $\bar{K}$--${}^6$Li Interaction and the Search for the $\Lambda (1405)$ Resonance
• Role of the $\Lambda (1600)$ in the $K^{-}p\to \Lambda {\pi }^0{\pi }^0$ reaction
• Probing the isospin structure and low-lying resonances in ${\Lambda }_c^{+}\to n{\bar{K}}^0{\pi }^{+}$ decays
• Lambda(1405) N to Y N transition in nuclear medium for non-mesonic absorption of Kbar in nucleus
• The dynamically generated $h_1$ state by the $K^{\ast }{\bar{K}}^{\ast }$ interaction and its $K_1(1270)\bar{K}$ and $b_1(1235)\pi$ decays
• Three body systems with strangeness and exotic systems