EPJ Web of Conferences (Jan 2024)

The Λ(1405) pole structure from Lattice QCD: A coupled-channel πΣ − KN study

  • 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

DOI
https://doi.org/10.1051/epjconf/202430301004
Journal volume & issue
Vol. 303
p. 01004

Abstract

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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 mπ ≈ 200 MeV and a lighter-than-physical kaon mass mK ≈ 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.