%0 Journal 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 Two-Pole Nature of the Λ ( 1405 ) Resonance from Lattice QCD
%J Physical review letters
%V 132
%N 5
%@ 0031-9007
%C College Park, Md.
%I APS
%M PUBDB-2024-07183
%M arXiv:2307.10413
%M MIT-CTP/5579
%P 051901
%D 2024
%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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:38364176
%U <Go to ISI:>//WOS:001179276700006
%R 10.1103/PhysRevLett.132.051901
%U https://bib-pubdb1.desy.de/record/618830