The present status in the field of strange mesons nuclei and neutron stars is reviewed. In particular, $\bar K N$ interaction, that governed by presence $\Lambda(1405)$, analyzed formation NN$ bound state discussed. Moreover, properties K$ dense nuclear matter are studied, connection with strangeness production collisions kaon condensation stars.

We study for the first time $p\Sigma^-\to K^-d$ and $K^-d\to p\Sigma^-$ reactions close to threshold show that they are driven by a triangle mechanism, with $\Lambda(1405)$, proton neutron as intermediate states, which develops singularity $\bar{K}d$ threshold. find mechanism involving virtual pion exchange $K^-p\to\pi^+\Sigma^-$ amplitude dominates over another one kaon $K^-p\to K^-p$ amplitud...

The negative-parity ground state of the Λ baryon lies surprisingly low in mass. At 1405.1MeV, it lies lower than the negative-parity ground state nucleon, even though it has a valence strange quark. Using the PACS-CS (2+ 1)-flavour full-QCD ensembles available through the ILDG, we employ a variational analysis using source and sink smearing to investigate the low-energy, odd-parity spectrum of ...

During its long-lasting history, the $$\varLambda (1405)$$ has become a benchmark for our understanding of $$\mathrm SU(3)$$ hadron dynamics. Starting with theoretical prediction and later experimental verification, until most recent debates on existence second broad pole, it emerged as fruitful research area sparking many developments. This review intends to provide reader current status -reso...

We study the pole properties of $\Lambda(1405)$ in a model-independent manner by applying Uniformized Mittag-Leffler expansion proposed our previous paper. The resonant energy, width and residues are determined expanding observable as sum resonant-pole pairs under an appropriate parameterization which expresses to be single-valued, fitting it experimental data invariant-mass distribution $\pi^+...

The mechanism for the formation of $\Lambda(1405)$ resonance is studied in a chiral quark model that includes quark-meson as well contact (four point) interactions. negative-parity $S$-wave scattering amplitudes strangeness $-1$ and $1$ are calculated within unified coupled-channel framework $KN$, $\bar{K}N$, $\pi\Sigma$, $\eta\Lambda$, $K\Xi$, $\pi\Lambda$, $\eta\Sigma$ channels possible genui...