The Λ(1405) pole structure from Lattice QCD: A coupled-channel π Σ − K N study

This report summarizes results of the first lattice QCD calculation of coupled-channel πΣ − K ¯ N scattering in the Λ(1405) region. This study was carried out using a single CLS ensemble with a heavier-than-physical pion mass m π ≈ 200 MeV and a lighter-than-physical kaon mass m K ≈ 487 MeV. Once th...

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Bibliographic Details
Published in:EPJ Web of conferences 2024, Vol.303, p.1004
Main Authors: Bulava, John, Cid-Mora, Bárbara, Hanlon, Andrew D., Hörz, Ben, Mohler, Daniel, Morningstar, Colin, Moscoso, Joseph, Nicholson, Amy, Romero-López, Fernando, Skinner, Sarah, Walker-Loud, André
Format: Article
Language:English
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Summary:This report summarizes results of the first lattice QCD calculation of coupled-channel πΣ − K ¯ N scattering in the Λ(1405) region. This study was carried out using a single CLS ensemble with a heavier-than-physical pion mass m π ≈ 200 MeV and a lighter-than-physical kaon mass m K ≈ 487 MeV. Once the finite-volume energy spectrum has been reliably extracted, the Lüscher method was employed to obtain scattering amplitudes. Through a variety of parametrizations of the two-channel K -matrix, the final results show a virtual bound state below the πΣ threshold and a resonance right below K ¯ N .
ISSN:2100-014X
2100-014X
DOI:10.1051/epjconf/202430301004