%0 Electronic Article
%A Bulava, John
%A Cid-Mora, Bárbara
%A Hanlon, Andrew D.
%A Hörz, Ben
%A Mohler, Daniel
%A Morningstar, Colin
%A Moscoso, Joseph
%A Nicholson, Amy
%A Romero-López, Fernando
%A Skinner, Sarah
%A Walker-Loud, André
%T The two-pole nature of the Λ(1405) from lattice QCD
%N arXiv:2307.10413
%M PUBDB-2023-04594
%M arXiv:2307.10413
%M MIT-CTP/5579
%D 2023
%Z 7 pages, 4 figures, and 1 table. added some references and revised introduction
%X This letter presents the first lattice QCD computation of the coupled channel πΣ\unicodex2013―KN scattering amplitudes at energies near 1405 MeV. These amplitudes contain the resonance Λ(1405) with strangeness S=−1 and isospin, spin, and parity quantum numbers I(J<sup>P</sup>)=0(1/2<sup>−</sup>). However, whether there is a single resonance or two nearby resonance poles in this region is controversial theoretically and experimentally. Using single-baryon and meson-baryon operators to extract the finite-volume stationary-state energies to obtain the scattering amplitudes at slightly unphysical quark masses corresponding to m<sub>π</sub> ≈ 200 MeV and m<sub>K</sub> ≈ 487 MeV, this study finds the amplitudes exhibit a virtual bound state below the πΣ threshold in addition to the established resonance pole just below the ―KN threshold. Several parametrizations of the two-channel K-matrix are employed to fit the lattice QCD results, all of which support the two-pole picture suggested by SU(3) chiral symmetry and unitarity.
%K resonance, pole (INSPIRE)
%K quark, mass (INSPIRE)
%K symmetry, chiral (INSPIRE)
%K lattice field theory (INSPIRE)
%K scattering amplitude (INSPIRE)
%K Lambda(1405) (INSPIRE)
%K parity (INSPIRE)
%K strangeness (INSPIRE)
%K unitarity (INSPIRE)
%K quantum number (INSPIRE)
%K parametrization (INSPIRE)
%K meson baryon (INSPIRE)
%K bound state (INSPIRE)
%K coupled channel (INSPIRE)
%K SU(3) (INSPIRE)
%K isospin (INSPIRE)
%K spin (INSPIRE)
%K finite size (INSPIRE)
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.3204/PUBDB-2023-04594
%U https://bib-pubdb1.desy.de/record/587898