Abstract
I give an overview of the current status of the lowest s-wave baryon resonance in the strangeness (\(S=-1\)) channel, the \(\varLambda (1405)\). Recent results from Lattice QCD calculations and new high-precision data from photoproduction experiments are highlighted in this talk. On the theoretical side various directions have been explored over the last two decades on the basis of coupled-channel chiral unitary models. New photoproduction data can be used to reduce statistical uncertainty of the predictions of such models. As for the systematic uncertainties, a recent comparative analysis of modern approaches exhibits many similarities but also large ambiguities in some of the predicted properties of the antikaon-nucleon scattering amplitudes. Some possible ways to reduce such a model dependence are discussed at the end of this manuscript.
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The speaker is deeply grateful to the organizers for the invitation to present his view on this interesting topic, financial support and inspiring conference.
This article belongs to the Topical Collection “NSTAR 2017–The International Workshop on the Physics of Excited Nucleons”.
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Mai, M. Status of the \({\mathbf {\Lambda (1405)}}\). Few-Body Syst 59, 61 (2018). https://doi.org/10.1007/s00601-018-1389-4
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DOI: https://doi.org/10.1007/s00601-018-1389-4