Review of the $\mathbf{\Lambda }$(1405): A curious case of a strange-ness resonance

Abstract

During its long-lasting history, the $\Lambda (1405)$ has become a benchmark for our understanding of the $\mathrm{SU}(3)$ hadron dynamics. Starting with its theoretical prediction and later experimental verification, until the most recent debates on the existence of the second broad pole, it emerged as a fruitful research area sparking many theoretical and experimental developments. This review intends to provide the reader with the current status of research on the $\Lambda (1405)$-resonance, reflecting on historical, experimental and theoretical developments. A common database for experimental results and a comparison of most recent theoretical approaches will be provided in the last two parts of this manuscript.

Invited contribution to the EPJST. (21 pages, 7 figures)

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• Three-body Unitarity with Isobars Revisited
• Predictions for the ${\Lambda }_b\to J/\psi \Lambda (1405)$ decay
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Cited by in corpus (28)

• Towards a theory of hadron resonances
• First study of the two-body scattering involving charm hadrons
• Constraining the $\overline{\mathrm{K}}\mathrm{N}$ coupled channel dynamics using femtoscopic correlations at the LHC
• Cross-channel constraints on resonant antikaon-nucleon scattering
• Two-pole nature of the $\Lambda (1405)$ from lattice QCD
• Lattice QCD study of $\pi \Sigma -\bar{K}N$ scattering and the $\Lambda (1405)$ resonance
• SPring-8 LEPS2 beamline: A facility to produce a multi-GeV photon beam via laser Compton scattering
• Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model
• New insights into the nature of the $\Lambda (1380)$ and $\Lambda (1405)$ resonances away from the SU(3) limit
• Pole position of $\Lambda (1405)$ measured in $d(K^{-},n)\pi \Sigma$ reactions
• Particle-dimer approach for the Roper resonance in a finite volume
• Theory introduction to baryon spectroscopy
• First Observation of the Semileptonic Decay ${\Lambda }_c^{+}\to p{K}^{-}{e}^{+}{\nu }_e$
• New insights into the pole parameters of the $\Lambda (1380)$, the $\Lambda (1405)$ and the $\Sigma (1385)$
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Study of the p$-$p$-$K${}^{+}$ and p$-$p$-$K${}^{-}$ dynamics using the femtoscopy technique
• Observation of $\Omega (2012{)}^{-}\to \Xi (1530)\bar{K}$ and measurement of the effective couplings of $\Omega (2012{)}^{-}$ to $\Xi (1530)\bar{K}$ and $\Xi \bar{K}$
• Charm-baryon semileptonic decays and the strange ${\Lambda }^{\ast }$ resonances: New insights from lattice QCD
• Structure of the $\mathbf{\Lambda }(1670)$ resonance
• Pole trajectories of the $\Lambda (1405)$ helps establish its dynamical nature
• Compositeness of hadrons, nuclei, and atomic systems
• The strangeness program at GlueX
• On Lowest Lying ${\frac{1}{2}}^{-}$ Octet Baryons
• Exotic properties of N^*(1895) and its impact on photoproduction of light hyperons
• Chirally motivated $\pi \Sigma$-$\bar{K}N$ model in a finite volume
• Role of ${\Sigma }^{\ast }(1/2^{-})$ baryons in ${\Lambda }_c\to \Lambda {\pi }^{+}{\pi }^{+}{\pi }^{-}$ decay
• Interactions of the Pseudoscalar Meson Octet and the Baryon Decuplet in the Continuum and a Finite Volume
• Producing $\Lambda (1405)$ and $\Lambda (1520)$ in ${\pi }^{-}p$ reaction to explore their inner structures